Re: squid benchmarking

On Mon, 2004/11/29 (MST), <kmuthukumar_at_SoftHome.net> wrote:

> I am getting TIME_WAIT in the polysrv and squid server too for 50
> reqs/sec rate. Attachment contains polygraph configuration.

Not sure what you mean by "getting TIME_WAIT in the polysrv". Please note
that you need to adjust the MSL knob of your TCP stack on Polygraph client
and server hosts. There are other OS-level tuning that may be necessary.
For details, please see http://www.measurement-factory.com/docs/FreeBSD/
and mimic that for your OS if needed.

> 1. Phase shifting from i-warm is not being done? what may be the
> problem there.

Note sure (will need to see console logs from both client and server
sides), but if you are getting many timeout errors, then Polygraph may
have trouble synchronizing phase schedule or even contacting all servers.
The latter is a precondition for quitting the warm-up phase.

> 2. Do we have to change network parameters to handle web
> requests from polclt to polysrv and squid?

Yes, see the URL above. As for Squid-side changes, you should not make any
changes that you will not be able to do on a production system. For
example, decreasing MSL to a few seconds is probably a bad idea on a
production box!

> 3. I am getting http result from web poly server as "HTTP/1.0
> 503 Service Unavailable". what may be the problem?

Most likely, Squid cannot talk to Polygraph servers because the
server-side OS is overwhelmed with traffic. See the URL above for OS
tuning tips.

HTH,

Alex.

-- 
Protocol performance, functionality, and reliability testing.
Tools, services, and know-how.
http://www.measurement-factory.com/