Re: [squid-users] Median Response Time

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On Tue, 8 May 2007 17:09:24 -0300
"Alexandre Correa" <alexandre@sabbath.com.br> wrote:

> Hello !!
>
> I´m getting some warning messages like:
>
> May 8 17:01:31 california squid[2600]: WARNING: Median response time
> is 421 milliseconds
>
> i know that is an option on squid.conf
>
> high_response_time_warning 300
>
> i want to know why my squid is ruuning with high responses time ?!
>
> my server:
> Dell poweredge 830
> P4 HT EMT64 3.2Ghz 1MB Cache
> 2.5 GB DDR2 RAM
>
> dedicated SATA 73gb 10.000 rpm for proxy
>
> my conf:
>
> cache_mem 64 MB
> maximum_object_size 50 MB
> minimum_object_size 0 KB
> maximum_object_size_in_memory 64 KB
> cache_dir aufs /var/spool/squid 61440 144 256
>

> memory_pools on
> memory_pools_limit 32 MB
>
>
> the cache_dir L1 and L2 is correct ? i used the formula from this list.. like
>
> cache_dir / 256 * 0.6 = L1
>

Hi Alexandre,

Well don't you think that your first level directories value of 144 is quite high. Why don't you use something like 64 or 72? But I really don't think that this is causing your high median service response time.

> server receives about 100 req/s and using cache_replace heap LFUDA and
> memory_replace heap GDSF
>
> any clue ??

Which squid version are you using and what is your operating system?

- From my experience, I don't think that your service time of 421 milliseconds is really a problem.
It really depends on how fast your internet link is and what your users are browsing?

When you got the service time of 421 milliseconds, how many users were actually using the proxy server? You also have to check what content or sites they were browsing?

Do you get this service time warning during your non-peak hours?

Now, if someone was using your proxy server to surf a particularly slow site, then this explains the high access time limited to one or two particular sites only.

During peak hours, these slow site access time gets average out with
those "faster" sites, thus giving it a lower and more accurate average
response time.

In fact, this was once asked on this mailing list before but your case could be different.

You can see the following link:
http://www.squid-cache.org/mail-archive/squid-users/200405/0408.html

I am just assuming things because I really don't have any idea of your proxy server setup and how fast your internet link is. What you consider high is considered low for someone using a satellite link like me.

Thanking you...

>
>
> Thanks !!
>
> --
>
> Sds.
> Alexandre J. Correa
> Onda Internet / OPinguim.net
> http://www.ondainternet.com.br
> http://www.opinguim.net
>

- --

With best regards and good wishes,

Yours sincerely,

Tek Bahadur Limbu

(TAG/TDG Group)
Jwl Systems Department

Worldlink Communications Pvt. Ltd.

Jawalakhel, Nepal

http://www.wlink.com.np
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Received on Tue May 08 2007 - 22:53:43 MDT