Re: [squid-users] Squid slow performance

On 24/07/2012 7:21 p.m., Alamgir Shamim wrote:
> Hello,
>
> We are using squid version squid-2.6.STABLE21-6.el5. But getting very
> poor performance.
>
> Our total Internet user are almost 750. At a time 500 to 600 user
> browse internet.
>
> all of them are getting slow response. it takes 10 to 30 second to load a page.
>
> Here I am giving you some out put.
>
> top out put...
>
> =========
>
> top - 12:54:09 up 31 days, 5:59, 2 users, load average: 0.18, 0.24, 0.24
>
> Tasks: 80 total, 1 running, 79 sleeping, 0 stopped, 0 zombie
>
> Cpu(s): 1.5%us, 0.2%sy, 0.0%ni, 93.5%id, 4.2%wa, 0.0%hi, 0.6%si, 0.0%st
>
> Mem: 2075016k total, 2020432k used, 54584k free, 233784k buffers
>
> Swap: 2031608k total, 96k used, 2031512k free, 1538140k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
>
> 12866 squid 15 0 100m 70m 2508 S 3 3.5 4:56.96 squid
>
>
> 6815 root 18 0 10936 4280 428 S 0 0.2 0:00.00 squid

>
>
>
> free -m output
>
> ============
>
> [root_at_proxy253 squid]# free -m
>
> total used free shared buffers cached
>
> Mem: 2026 1973 53 0 228 1502
>
> -/+ buffers/cache: 242 1783
>
> Swap: 1983 0 1983
>
> Processor infor
>
> ==============
>
> processor : 0
>
> vendor_id : GenuineIntel
>
> cpu family : 15
>
> model : 4
>
> model name : Intel(R) Xeon(TM) CPU 3.20GHz
>
> stepping : 3
>
> cpu MHz : 3200.343
>
> cache size : 2048 KB
>
> physical id : 0
>
> siblings : 2
>
> ------------------------
>
> processor : 1
>
> vendor_id : GenuineIntel
>
> cpu family : 15
>
> model : 4
>
> model name : Intel(R) Xeon(TM) CPU 3.20GHz
>
> stepping : 3
>
> cpu MHz : 3200.343
>
> cache size : 2048 KB
>
> physical id : 0
>
> siblings : 2
>
> -------------------------
>
> Could you please let me know what might be the reason for getting slow
> performance. We have 14 mbps of Internet bandwidth.
>
> We are doing some content filtering also with squid.

There are several possible reasons:

* you have configured squid in a inefficient way
  - I'm happy to do free performance audits here if you want to paste
your squid.conf to the list (obscure the cachemgr_passwd detail though
please)

* you are content filtering
  - this is a major slowdown for Squid no matter what type of filtering
is being done

* overloaded or slow disks I/O speeds on disk cache
  - only relevant if you are disk caching

* 2.6 will be adding to the slowdown
  - 2.7 series had a performance focus on development and is a good 20%
faster just in the code.
  - 2.6 has low HTTP/1.1 compliance, meaning you loose out on many
HTTP/1.1 performance features available in later releases.

Amos
Received on Tue Jul 24 2012 - 12:38:28 MDT