Re: [squid-users] squid becomes very slow during peak hours

goody goody wrote:
> Hi there,
>
> I am running squid 2.5 on freebsd 7,

As Adrian said, upgrade. 2.6 (and 2.7) support kqueue under FreeBSD.

> and my squid box respond very slow during peak hours. my squid machine have twin dual core processors, 4 ram and following hdds.
>
> Filesystem Size Used Avail Capacity Mounted on
> /dev/da0s1a 9.7G 241M 8.7G 3% /
> devfs 1.0K 1.0K 0B 100% /dev
> /dev/da0s1f 73G 35G 32G 52% /cache1
> /dev/da0s1g 73G 2.0G 65G 3% /cache2
> /dev/da0s1e 39G 2.5G 33G 7% /usr
> /dev/da0s1d 58G 6.4G 47G 12% /var
>
>
> below are the status and settings i have done. i need further guidance to improve the box.
>
> last pid: 50046; load averages: 1.02, 1.07, 1.02 up
>
> 7+20:35:29 15:21:42
> 26 processes: 2 running, 24 sleeping
> CPU states: 25.4% user, 0.0% nice, 1.3% system, 0.8% interrupt, 72.5% idle
> Mem: 378M Active, 1327M Inact, 192M Wired, 98M Cache, 112M Buf, 3708K Free
> Swap: 4096M Total, 20K Used, 4096M Free
>
> PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
> 49819 sbt 1 105 0 360M 351M CPU3 3 92:43 98.14% squid
> 487 root 1 96 0 4372K 2052K select 0 57:00 3.47% natd
> 646 root 1 96 0 16032K 12192K select 3 54:28 0.00% snmpd
>
SNIP
> pxy# iostat
> tty da0 pass0 cpu
> tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id
> 0 126 12.79 5 0.06 0.00 0 0.00 4 0 1 0 95
>
> pxy# vmstat
> procs memory page disks faults cpu
> r b w avm fre flt re pi po fr sr da0 pa0 in sy cs us sy id
> 1 3 0 458044 103268 12 0 0 0 30 5 0 0 273 1721 2553 4 1 95
>

Those statistics show wildly different utilization. The first (top, I
assume) shows 75% idle (or a whole CPU in use). The next two show 95%
idle (in effect, one CPU 20% used). How close (in time) were the
statistics gathered?

>
> some lines from squid.conf
> cache_mem 256 MB
> cache_replacement_policy heap LFUDA
> memory_replacement_policy heap GDSF
>
> cache_swap_low 80
> cache_swap_high 90
>
> cache_dir diskd /cache2 60000 16 256 Q1=72 Q2=64
> cache_dir diskd /cache1 60000 16 256 Q1=72 Q2=64
>
> cache_log /var/log/squid25/cache.log
> cache_access_log /var/log/squid25/access.log
> cache_store_log none
>
> half_closed_clients off
> maximum_object_size 1024 KB
>
> if anyother info required, i shall provide.
>

The types (and number) of ACLs in use would be of interest as well.

> Regards,
> .Goody.
>

Chris
Received on Tue Jun 30 2009 - 21:26:00 MDT