Compiled Linux Kernel With ICC
Jun 16, 2008
Programs compiled with the Intel C++ compiler run 20-30% (up to 450% in some rare cases) faster than their GCC counterparts.
I have successfully compiled MySQL 5, PHP 5, eAccelerator and nginx with ICC 10.1.015. I was wondering, if anyone has compiled the linux kernel with icc? There are some linux vendors who supply icc compiled kernels, and there are some docs on intels site about compiling the kernel with icc... so it's doable.
But I want to know if anyone has done it on a VPS? What was your experience? Did the system run faster than before? Or did you face some weird situations?
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Feb 22, 2015
I have experimented a strange behaviour on plesk linux 12.0.18 Update #33
Basically:
1. I have recompiled Apache with more file descriptors
2. Several days later watchdog did not work properly. Support requested me to remove and install wd
3. I ran the autoinstaller. All my compiled version where replaced.
Watchdog is ok now, but I have to recompile Apache.
I have been searching on forum and kb but could not find any reoccurance.
Question : Is there a way to avoid this ?
Compilation performed based on article [URL]
after having executed /usr/local/psa/admin/bin/autoinstaller --debug
[root@ns7 scripts]# rpm -qa --last | grep "Sat 21 Feb 2015"
psa-watchdog-12.0.18-cos6.build1200140707.14.x86_64 Sat 21 Feb 2015 01:12:58 PM CET
php-tidy-5.3.3-40.el6_6.x86_64 Sat 21 Feb 2015 01:10:07 PM CET
[Code]....
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Feb 23, 2008
Do we have to be concerned with this issue?
[url]
Is Centox 4x system included in the Kernel Flaw above?
Are all Linux servers at risk now?
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Sep 12, 2007
starting a GSP (Game Server Provider) within the next 4-6 months.
One big factor I will need to tackle is optimizing the linux kernel on CentOS for game servers.
This entails accelerating the kernel to allow for 1000fps in Counter strike and Counter Strike Source, as well as tailoring the kernel to provide very reliable server side fps.
My question is, what would be some good sources about possibly doing this, also how would I go about rebuilding the kernel, and is it worth learning how to do myself even though my knowledge is fairly minimal in Linux?
Also does anyone know of specifics about what I need to modify in order to do this.
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Mar 7, 2007
I have followed the process below:
Fedora Core 6
In a first step, the yum repository must be configured. The .repo file is available in Ingo Molnar's project directory [url].
# cd /etc/yum.repos.d
# wget http://people.redhat.com/mingo/realtime-preempt/rt.repo
Only the first time, yum must be called in installation mode:
# yum install kernel-rt
Later on, the command
# yum update kernel-rt
will update the kernel patch, should a more recent version be available. By default, the newly installed kernel is made the default boot kernel. The realtime-enabled kernel is, therefore, immediately active after the system has been restarted.
To check if enabled type:
# cat /proc/sys/kernel/kernel_preemption
1
Then this:
# cat /proc/sys/kernel/preempt_max_latency
39
As an debugging aid, the condition that led to this latency is also available:
# cat /proc/latency_trace
preemption latency trace v1.1.5 on 2.6.19-1.rt10.0001
--------------------------------------------------------------------
latency: 39 us, #2/2, CPU#0 | (M:rt VP:0, KP:0, SP:1 HP:1 #P:1)
-----------------
| task: posix_cpu_timer-3 (uid:0 nice:0 policy:1 rt_prio:99)
-----------------
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
/ ||||| | /
<...>-3 0...1 39us : __schedule (__schedule)
As a role of thumb, the maximum (worst-case) latency amounts to approximately 105 / clock frequency on an idle system. For example, a maximum latency of about 100 microseconds can be expected in a 1 GHz-CPU. If the value displayed is off by more than one order of magnitude, something is not working correctly.
Totally lost here! can someone explain this latency figure of 39, how do I know if this is good or bad figure?
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Feb 23, 2007
is there anything I should do now?
everthing generally seems fines but I have a strange thing going on with an images folder that a php script puts users images in (so my users can upload files). this folder was previously 777 and now phpexec has been installed the images are not showing up. I get a "You don't have permission to access" message on the image files. I tried chmod'ing the images folder to 766 and 755 and the same thing happens. This has nothing to do with the php script as I can't even access the image files by typing in the URL in a browser.
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Nov 5, 2007
It is possible to make code execution on the server with applications such as FastCGI or Zend Optimizer, but the code isn't compiled for good, it's more of a bytecode that is created on the fly, correct?
I'd like to know if it's possible to compile code (PHP, Python, Ruby, etc...) so that when you request a page, the compiled code is executed the same way as compiled C++ code with cgi-bin.
I'm asking because it would be quite efficient in case of high-traffic web sites instead of running intermediary code (bytecode).
Is it possible? What do you think is the more efficient, less resource-intensive and fastest way to execute dynamic-content pages?
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May 30, 2009
Few weeks ago my customer began to notice problem with server load.
I look to munin graphs and see this:
http://dl.getdropbox.com/u/252944/iowait/iowait-hr.png
iowait creates high performance degradation. There was no changes in server software & configuration. Sometimes server work very slow, count of apache processes is high - there is no any processes and scripts who can use a lot of hdd resources.
Sites located on customer server does not create high load, and not subjected to any attacks.
I received response from DC:
I did some research for this and it seems that other people has experienced similar issues and is reporting that it is a kernel bug have you ran yum update to receive the latest kernel if not you can try and update and see if that may resolve your issue.
CENTOS 5.2
Cpanel / WHM
Linux *** 2.6.18-92.1.22.el5PAE #1 SMP Tue Dec 16 12:36:25 EST 2008 i686 i686 i386 GNU/Linux
I try to run "yum update kernel" but it seems installed kernel is up to date.
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Dec 12, 2008
I am currently researching the options open to me for Virtualisation, the two main ones I have seen are Xen or KVM.
I mainly use CentOS (RHEL), but have read that the version of Xen with it is very old, broken and unstable. KVM isn't included in the kernel that ships with CentOS, as it is too old, apparently it was first featured in Kernel v2.6.20. There isn't likely to be an update till RHEL6, which is due for release first quarter of 2010. I can't wait over a year, so need to find another Distro for use as the Host OS/Hypervisor.
I have built a pretty powerful server, it has an Intel Xeon 3230 which has VT - so I might be better off using KVM over Xen. I am going to collocate this server, so realistically I can make this decision only once - as it would be a PITA to re-install a host Linux distro remotely.
I did a search on distrowatch for distros with the latest version of the kernel, and Slackware came up as being just one minor version behind the most current (v2.6.27.7).
Now this distro is very mature, so should be a fairly safe bet, but it is a 32bit version and can't host 64bit VMs. I have 8GB of ram so want to be able to use it all, and offer the choice of 32/64bit VMs. So that's that out of the window.
I have used Arch Linux on and off for a couple of years as a workstation OS, but because it is so bleeding edge, when pacman updates it can break itself. But I suppose if I just use it as the Host OS, and never let it update/reboot, then it won't break. It should be fairly lightweight and stable, as I will be installing the bare minimum packages. I have a management card, so if the server fails to boot, then I can still remote in to fix it.
If I do want to update the kernel, is it possible to update without rebooting? I think it is somehow... unless I can just reboot during an unused time at 3am or something.
As you can tell I am leaning towards KVM on Arch Linux (x86_64). Is this a good plan?
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Jan 19, 2007
Is it safe to upgrade to the latest Linux kernel version 2.6.19.2 (released on January 10th, 2007) ? Is there any reported problems or have anyone faced issues after upgrading?
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Jul 31, 2009
I am really not familiar with MPM prefork. Should apache use MPM prefork or is there a better alternative? If yes, what would that be and how to use that alternative?
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Apr 26, 2014
I have 2.4.x version installed on RHEL and I need to install same version on Solaris 10. How can I find out what packages/modules were compiled for RHEL so that I can download same for Solaris and compile them.
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May 9, 2009
I'm trying to setup the Clozure Common Lisp implementation for CGI web programming. I've made a hello application and compiled it.
I can type ./index.cgi at the terminal and the properly formatted header and some text are displayed.
When I try to view the index page though the web browser I get an internal server error.
Quote:
Couldn't load lisp heap image from
[Sun May 10 09:31:25 2009] [error] [client 127.0.0.1] Premature end of script headers: index.cgi
I'm wondering if this is a Lisp problem or a problem with the web server/permissions.
I wrote a hello world CGI app in C and ran that through the browser without any problems.
I applied the same permissions from the C app to the Lisp app and still had the same problem.
I *think* this is a Lisp problem, but just felt that I should check with some people who are more familiar with server setups than myself.
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Mar 29, 2007
we have one box in hivelocity.net that has been down so many times this month that we were forced to remove links to siteuptime where we were once so proud of having a 99.7% uptime for 3 years in theplanet.
syslog shows that just before crashing, these entries were made:
kernel: kernel BUG at mm/rmap.c:479
kernel: invalid operand:0000 [#1]
dmesg also shows this:
...
Brought up 2 CPUs
zapping low mappings.
checking if image is initramfs... it is
Freeing initrd memory: 482k freed
NET: Registered protocol family 16
PCI: PCI BIOS revision 2.10 entry at 0xf9f20, last bus=1
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
mtrr: your CPUs had inconsistent fixed MTRR settings
mtrr: probably your BIOS does not setup all CPUs.
mtrr: corrected configuration.
...
i've googled these messages and they point to ram problems.
hivelocity.net claims to have done diagnostics on the box and that there were no problems reported.
they said this is a result of a sys configuration problem made by us.
any ideas?
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May 20, 2009
running centos/virtuozzo 2.6.18-028stab062.3
when i configure vmware it asks at one point for kernel header files. where would i find them to match the current kernel?
i asked at parallels forums but help there is very scarce. i checked openVZ repositories and they dont yet have headers for this version.
what are my options? i have one last windows machine left and want to run it in VMware.
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Apr 29, 2007
Last year I ordered a new server with Centos 4.3 and it had the kernel kernel 2.6.9-34.0.2ELsmp installed. It runned fine and I didn't update any packages since then.
Today I started getting a problem where both mysqld and kswapd0 uses very high amounts of CPU, spiking up to 100% and my memory usage is at 99% all the time. The problem seems exactly the same as the one mentioned in this thread.
In that thread the exact same kernel is said to be insecure and to cause this problem. I also came across a centOS bug that reports this problem with high cpu, mem usage and mysql & kswapd0 consuming all resources.
In the linked thread the person solved the problem by upgrading to kernel 2.6.9-42 using rpms but others recommended a newer kernel or a custom compiled kernel for CentOS.
Apparently when they used yum it said 34.0.2 was the latest kernel.
What should I do to upgrade the kernel, which version should i upgrade to, and where do I get it from? I won't be able to compile a custom kernel and I've only installed basic rpm packages before.
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Mar 26, 2014
I am running Apache on a Windows server and it is up and running.I downloaded and installed:
Apache 2.4.9 Win32 [Apache VC11 Binary] httpd-2.4.9-win32-VC11.zip
And included ModSecurity from download: modules-2.4-win32-VC11.zip..
The version of ModSecurity is mod_security-2.7.7 . It is up and running, but I get a warning:
ModSecurity: Loaded PCRE do not match with compiled!
Here's the difference in the PCRE from the logs:
PCRE compiled version="8.33 "; loaded version="8.34 2013-12-15".
The compiled version does not match the loaded version. Is this something I should be concerned about and try to find compiled versions that match?
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May 13, 2007
I am trying to install the kernel source.
I have downloaded kernel-2.6.20-1.2948.fc6.src.rpm
I am using fedora 6 64bit.
here are my current kernels:
kernel-headers-2.6.20-1.2948.fc6
kernel-devel-2.6.20-1.2944.fc6
yum-kernel-module-1.0.3-1.fc6
kernel-2.6.20-1.2944.fc6
kernel-devel-2.6.20-1.2948.fc6
kernel-2.6.20-1.2948.fc6
here is what I seen when I installed kernel-2.6.20-1.2948.fc6.src.rpm
rpm -ivh kernel-2.6.20-1.2948.fc6.src.rpm
1:kernel warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
warning: user brewbuilder does not exist - using root
########################################### [100%]
warning: user brewbuilder does not exist - using root
warning: group brewbuilder does not exist - using root
then when I ran:
rpmbuild -bp --target=$(uname -m) /usr/src/redhat/SPECS/kernel-2.6.spec
I seen this error:
+ Arch=x86_64
+ make ARCH=x86_64 nonint_oldconfig
In file included from /usr/include/sys/socket.h:35,
from /usr/include/netinet/in.h:24,
from /usr/include/arpa/inet.h:23,
from scripts/basic/fixdep.c:117:
/usr/include/bits/socket.h:310:24: error: asm/socket.h: No such file or directory
make[1]: *** [scripts/basic/fixdep] Error 1
make: *** [scripts_basic] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.93770 (%prep)
I need to have this installed to get a app installed etc...
suggestions or ideas?
thanks
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Apr 4, 2009
I have a Xen VPS. I started with a Debian 4 image and have since upgraded to Debian 5. Firstly was this advisable? Secondly what Kernel version should I be running, or rather is it set by my installation or by the Xen server?
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Feb 15, 2007
Does it take 2 hours to have a new kernel up and running? The tech is taking forever to finish.
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Apr 24, 2009
as part of a project I have lately been looking into various aspects of kernel tuning. Most notably lately tuning the TCP stack for more efficient memory usage/throughput.
Thought I would start this thread to mention some of the tools I'd found for doing testing and see what anyone else had to recommend.
So far my favorite of the bunch is nuttcp. Its easy to use and gives a very good idea of how much of your bandwidth you are able to utilize.
A few interesting web pages are as follows for anyone interested in the topic:
[url]- Tuning TCP for High Bandwidth Delay networks
[url]- TCP Tuning Cook book, some interesting information in there as well
[url]...formanceTuning - Performance Tuning TWiki. Has a list of useful tools, flags for existing tools and ways to monitor network performance from a system level, along with some suggestions of things to correct
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Aug 4, 2009
What is the best way to find out which filesystems and harddrive drivers you can remove? Obviously, i need ext2,3 but how do you find which HD you only need?
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Jun 15, 2009
recently,my dedicated server down frequently,
i can not find any important info from /var/log/messages
but i find some records many time on it,those like
----------------------------------
Jun 15 05:30:40 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jun 15 05:30:40 server kernel: ata1.00: (irq_stat 0x40000001)
Jun 15 05:30:40 server kernel: ata1.00: cmd 25/00:08:42:23:d2/00:00:2c:00:00/e0 tag 0 cdb 0x0 data 4096 in
Jun 15 05:30:40 server kernel: res 51/40:00:42:23:d2/00:00:2c:00:00/e0 Emask 0x9 (media error)
Jun 15 05:30:40 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:30:40 server kernel: ata1: EH complete
Jun 15 05:30:42 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jun 15 05:30:42 server kernel: ata1.00: (irq_stat 0x40000001)
Jun 15 05:30:42 server kernel: ata1.00: cmd 25/00:08:42:23:d2/00:00:2c:00:00/e0 tag 0 cdb 0x0 data 4096 in
Jun 15 05:30:42 server kernel: res 51/40:00:42:23:d2/00:00:2c:00:00/e0 Emask 0x9 (media error)
Jun 15 05:30:42 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:30:42 server kernel: ata1: EH complete
Jun 15 05:30:44 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jun 15 05:30:51 server kernel: ata1.00: (irq_stat 0x40000001)
Jun 15 05:30:51 server kernel: ata1.00: cmd 25/00:08:42:23:d2/00:00:2c:00:00/e0 tag 0 cdb 0x0 data 4096 in
Jun 15 05:30:51 server kernel: res 51/40:00:42:23:d2/00:00:2c:00:00/e0 Emask 0x9 (media error)
Jun 15 05:30:51 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:30:51 server kernel: ata1: EH complete
Jun 15 05:30:51 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jun 15 05:30:51 server kernel: ata1.00: (irq_stat 0x40000001)
Jun 15 05:30:51 server kernel: ata1.00: cmd 25/00:08:42:23:d2/00:00:2c:00:00/e0 tag 0 cdb 0x0 data 4096 in
Jun 15 05:30:51 server kernel: res 51/40:00:42:23:d2/00:00:2c:00:00/e0 Emask 0x9 (media error)
Jun 15 05:30:51 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:30:51 server kernel: ata1: EH complete
Jun 15 05:30:51 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
Jun 15 05:30:51 server kernel: ata1.00: (irq_stat 0x40000001)
Jun 15 05:30:51 server kernel: ata1.00: cmd 25/00:08:42:23:d2/00:00:2c:00:00/e0 tag 0 cdb 0x0 data 4096 in
Jun 15 05:30:51 server kernel: res 51/40:00:42:23:d2/00:00:2c:00:00/e0 Emask 0x9 (media error)
Jun 15 05:30:51 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:30:52 server kernel: ata1: EH complete
Jun 15 05:31:26 server kernel: ata1.00: configured for UDMA/133
Jun 15 05:31:30 server kernel: sd 0:0:0:0: SCSI error: return code = 0x08000002
Jun 15 05:31:33 server kernel: sda: Current [descriptor]: sense key: Medium Error
Jun 15 05:31:36 server kernel: Add. Sense: Unrecovered read error - auto reallocate failed
Jun 15 05:31:36 server kernel:
Jun 15 05:31:39 server kernel: Descriptor sense data with sense descriptors (in hex):
Jun 15 05:31:46 server kernel: 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
Jun 15 05:31:51 server kernel: 2c d2 23 42
Jun 15 05:31:56 server kernel: end_request: I/O error, dev sda, sector 751969090
Jun 15 05:31:57 server kernel: ata1: EH complete
Jun 15 05:31:57 server kernel: SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB)
Jun 15 05:31:58 server kernel: sda: Write Protect is off
Jun 15 05:31:58 server kernel: SCSI device sda: drive cache: write back
Jun 15 05:31:59 server kernel: SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB)
Jun 15 05:32:03 server kernel: sda: Write Protect is off
Jun 15 05:32:04 server kernel: SCSI device sda: drive cache: write back
-------------------
is it safe ? or any hardware error?
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Jul 7, 2009
can i upgrade my kernel?
yum cant find any new update but my kernel version is 2.6.18-128.1.1.el5.028stab062.3PAE
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Jun 13, 2009
I have following error in kernel update with yum:
Downloading Packages:
Running rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
Package kernel conflicts with ecryptfs-utils < 44.
Complete!
So kernel not updated yet.
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Jun 20, 2009
I copied the default config file and renamed it as .config but I get this:
Code:
WARNING: No module dm-mem-cache found for kernel 2.6.27.10-grsec, continuing anyway
WARNING: No module dm-region_hash found for kernel 2.6.27.10-grsec, continuing anyway
WARNING: No module dm-message found for kernel 2.6.27.10-grsec, continuing anyway
WARNING: No module dm-raid45 found for kernel 2.6.27.10-grsec, continuing anyway
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Jul 20, 2009
My current kernel version is "2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:17:21 EST 2007 i686 athlon i386 GNU/Linux". I want it to be upgraded since it is old. I have been told by our server management company that the latest kernel distributed from yum is kernel.i686 0:2.6.9-78.0.22.E. Can anyone tell me if this version is safe and secure enough? It is a CentOS release 4.7 (Final) server with cPanel installed.
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Aug 1, 2009
i have a dedicated server with Centos 5.2 32bit.
my cpu is 64bit but for some software, datacenter install 32bit for me.
i need more ram and order to datacenter, before my ram was 4 Gig and now my ram is 6 gig . but cpu just use 3 gig of ram.
i install kernel-PAE with "yum install kernel-PAE " command and my ram down to 2.5 Gig. now my server used just 2.5 gig of ram.
i can not reformat server because of i have some vps in this server ( Xen vps )
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Jul 12, 2009
when doing 2.6.26+ or w/e it is, how do you enable conntrack, what options do i need to enable under make menuconfig?
net.netfilter.nf_conntrack_acct = 1
net.netfilter.nf_conntrack_generic_timeout = 120
error: "net.netfilter.nf_conntrack_icmp_timeout" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_close" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_time_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_last_ack" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_close_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_fin_wait" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_established" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_syn_recv" is an unknown key
error: "net.netfilter.nf_conntrack_tcp_timeout_syn_sent" is an unknown key
error: "net.netfilter.nf_conntrack_udp_timeout" is an unknown key
error: "net.netfilter.nf_conntrack_udp_timeout_stream" is an unknown key
net.netfilter.nf_conntrack_max = 262144
and how do i know which hardware/devices that i can remove?
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