Php Accelerator Combo

This box is a dual xeon, 4gb memory server with a dozen domains only. What do you recommend for optimal performance and speed?

[xcache-common]

zend_extension = /usr/local/lib/php/extensions/no-debug-non-zts-20060613/xcache.so

[xcache.admin]
xcache.admin.auth = On
xcache.admin.user = ""
xcache.admin.pass = ""

[xcache]
; ini only settings, all the values here is default unless explained

; select low level shm/allocator scheme implemenation
xcache.shm_scheme = "mmap"

; to disable: xcache.size=0
; to enable : xcache.size=64M etc (any size > 0) and your system mmap allows
xcache.size = 0M

; set to cpu count (cat /proc/cpuinfo |grep -c processor)
xcache.count = 1

; just a hash hints, you can always store count(items) > slots
xcache.slots = 8K

; ttl of the cache item, 0=forever
xcache.ttl = 0

; interval of gc scanning expired items, 0=no scan, other values is in seconds
xcache.gc_interval = 0

; same as aboves but for variable cache
xcache.var_size = 100M
xcache.var_count = 1
xcache.var_slots = 8K
; default ttl
xcache.var_ttl = 0
xcache.var_maxttl = 0
xcache.var_gc_interval = 300

xcache.test = Off
; N/A for /dev/zero
xcache.readonly_protection = Off
; for *nix, xcache.mmap_path is a file path, not directory.
; Use something like "/tmp/xcache" if you want to turn on ReadonlyProtection
; 2 group of php won't share the same /tmp/xcache
; for win32, xcache.mmap_path=anonymous map name, not file path
xcache.mmap_path = "/dev/zero"

; leave it blank(disabled) or "/tmp/phpcore/"
; make sure it's writable by php (without checking open_basedir)
xcache.coredump_directory = ""

; per request settings
xcache.cacher = On
xcache.stat = On
xcache.optimizer = On

[xcache.coverager]
; per request settings
; enable coverage data collecting for xcache.coveragedump_directory and xcache_coverager_start/stop/get/clean() functions (will hurt executing performance)
xcache.coverager = Off

; ini only settings
; make sure it's readable (care open_basedir) by coverage viewer script
; requires xcache.coverager=On
xcache.coveragedump_directory = ""

[eAccelerator]
extension="eaccelerator.so"
eaccelerator.shm_size="16"
eaccelerator.cache_dir="/var/cache/eaccelerator"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"

;[Zend]
;zend_extension_manager.optimizer=/usr/local/Zend/lib/Optimizer-3.3.0
;zend_extension_manager.optimizer_ts=/usr/local/Zend/lib/Optimizer_TS-3.3.0
;zend_optimizer.version=3.3.0

;extension=/usr/local/lib/php/extensions/no-debug-non-zts-20020429/ffmpeg.so

[Zend]
;zend_extension_manager.optimizer=/usr/local/Zend/lib/Optimizer-3.3.0
;#zend_extension_manager.optimizer_ts=/usr/local/Zend/lib/Optimizer_TS-3.3.0
;#zend_optimizer.version=3.3.0
;#zend_extension=/usr/local/Zend/lib/ZendExtensionManager.so
;#zend_extension_ts=/usr/local/Zend/lib/ZendExtensionManager_TS.so

zend_extension_manager.optimizer=/usr/local/Zend/lib/Optimizer-3.3.0
zend_extension_manager.optimizer_ts=/usr/local/Zend/lib/Optimizer_TS-3.3.0
zend_optimizer.version=3.3.0
zend_extension=/usr/local/Zend/lib/ZendExtensionManager.so
zend_extension_ts=/usr/local/Zend/lib/ZendExtensionManager_TS.so