today i have disabled Write and Read cache into the Perc3/Di RAID Controller (128MB onboard),
cache disabled client_http.requests = 152.155593/sec cpu_usage = 76.142118%
cache enabled client_http.requests = 153.641384/sec cpu_usage = 99.619241%
this is very strange, but i found the issue
Giulio Cervera ha scritto:
The problem is the following: We have approximately 700Reqs/sec distributed on
4 x Dell 2650 (sibling with digest) after a load balancer
each one with
2 x Xeon 1.8Ghz (HT disabled)
2GB Ram
PERC3/Di RAID controller
5 x 36GB HD SCSI 10k (2 RAID1 for os and swap, 3 for cache)
3 NIC, 1 internet, 1 intranet, 1 proxy lan (digest and proxy comunication)
52Mbit link
Slackware 8.1 Squid 2.5.STABLE4
some line of fstab /dev/sdb1 /var/cache/spool/0 reiserfs noatime,notail 1 2 /dev/sdc1 /var/cache/spool/1 reiserfs noatime,notail 1 2 /dev/sdd1 /var/cache/spool/2 reiserfs noatime,notail 1 2
configure options:
--prefix=/usr --exec_prefix=/usr --bindir=/usr/sbin --libexecdir=/usr/lib/squid --sysconfdir=/etc/squid --localstatedir=/var --with-aufs-threads=48 --with-pthreads --with-aio --enable-async-io --enable-storeio=diskd,aufs --disable-wccp --enable-default-err-language=English --enable-err-languages=English --disable-ident-lookups --enable-underscores --enable-removal-policies=heap,lru --enable-snmp --enable-cache-digests --enable-gnuregex
and actually configuration:
cache_mem 64 MB cache_swap_low 85 cache_swap_high 90 maximum_object_size 65536 KB maximum_object_size_in_memory 24 KB cache_replacement_policy heap LFUDA memory_replacement_policy heap GDSF cache_dir diskd /var/cache/spool/0 28000 96 256 Q1=72 Q2=64 cache_dir diskd /var/cache/spool/1 28000 96 256 Q1=72 Q2=64 cache_dir diskd /var/cache/spool/2 28000 96 256 Q1=72 Q2=64 memory_pools_limit 50 MB cache_access_log /var/cache/log/access.log cache_log /var/cache/log/cache.log buffered_logs on
Squid sames to work fine, but cpu usage after ~60Req/Sec on each server is always 100%
I have tried many changes to squid.conf with no results.
Last question I have also to upgrade our os to RedHat AS3, any experience with it?
thanks
--
*Giulio Cervera*
EDS PA SpA Via Atanasio Soldati 80 00155 Roma (Italy) tel: +39 06 22739 270 fax: +39 06 22739 233 e-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
