Re: [squid-users] 2.6-stable3 performance weirdness with polymix-4 testing

On Mon, Aug 28, 2006, Pranav Desai wrote:

> >A single drive and you expect 1000 req/s? Is this a solid-state drive or
> >something with infinitely small seek time?
> >
> No, its just a regular drive. I am already working on that, but its
> kind of difficult to get things changed quickly :-).
> But the good part is that even with 1 disk its able to do 1000 req/s
> atleast for the first 6 hrs, so I am sure I can push it more once I
> get some better hardware.

I think you'll find that the performance is degrading because:

* (a) the disk write queues are slowly filling up and taking longer to write;
* (b) the disk is filling up and fragmentation+object replacement+non-linear
      file allocation kicks in.

Faster hardware won't fix that. More disks may. COSS will help a lot for
the smaller objects. But a lot more work needs to be done to improve the
Squid disk store under load.

> It didnt in the first phase. In fact it did very well in the first
> phase compared to the first phase of 2.5, but somehow after the idle
> phase it just wasnt able to recover and the polybench wasnt even able
> to push to 1000 req/s because the response times were so high.

Whats your squid.conf look like? It sounds like the disks just couldn't
keep up with your request rate.

Adrian
Received on Mon Aug 28 2006 - 19:39:50 MDT