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SubjectRe: 2.2.7 fixes Apache problem? (Was: Re: 2.2.5 optimizations for web benchmarks?)

I'm not sure if I can say that 2.2.7 _fixes_ the apache problem or
merely _masks_ it.

With 2.2.7, the tcp performance (to certain clients) has
gone up quite a bit due to some tcp changes (initial snd_cwnd, etc.).
In fact, it's gone up so much, that apache is no longer bottlenecked
in my setup - I'm now constrained by disk I/O performance, since
specweb loads (and filesets) are much higher than can be accomodated
in memory.

In other words, in 2.2.5, I was able to get the apache performance
collapse after pushing it beyond the limit. In 2.2.7, I haven't been
able to push apache beyond the limit, at least not on my
dual PII/450, 512 MB RAM system.

cheers,
karthik




> http://bugs.apache.org/index/full/4268, saying:

> > I'm running some specweb tests on apache, and with the specific config file
> > from the distribution, performance drastically drops after reaching
> > high loads - and remains poor even after the specweb tests stop.
>
> This happened on kernel 2.2.5 with Apache 1.3.4 and 1.3.6.
>
> Fast forward two weeks to the present. He now reports:
> > The mystery continues. I got round to trying out 1.3.6 again this evening,
> > this time on 2.2.7. I did _not_ see the performance drop off. Just to
> verify,
> > I rechecked on the stock 2.2.5 kernel, and the drop off is there.
> >
> > So _something_ has been fixed between 2.2.5 and 2.2.7 that has made this
> problem
> > go away. I'll keep plugging away as I get spare time to see if I can get
> the
> > problem to occur.
>
> Makes one want to repeat Mindcraft's Apache benchmark with 2.2.7,
> doesn't it?
> - Dan
>
> http://www.kegel.com/mindcraft_redux.html

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