Re: Perforamnce comparison between 2.3.8 and 2.2.10
Chuck Lever (cel@monkey.org)
Mon, 28 Jun 1999 15:43:21 -0400 (EDT)
On Sun, 27 Jun 1999, Rudolf Leitgeb wrote:
> On Sun, 27 Jun 1999, you wrote:
> > Ehh.. Wasn't the main performance gain for the multi-processor systems? I
> > wasn't really awake when I read the thread, but that was something that
> > I remembered.
>
> Well, I run SMP and got the same results that Marc got. Evidently none
> of us was able to verify the supposedly massinve speed improvements
> with the 2.3.8 kernel. I personally rather find it out here on this
> mailing list than learn about it from Mindcraft ;-)
>
> One interesting point though: When I did the kernel compile tests under
> 2.3.8, I would not only get higher sys times, but also higher user
> times, which makes me wonder ...
i've also noticed that 2.3.8 is slower. but i think the problem is that
swapping hasn't been tuned properly for the new page cache logic -- this
results in more iterations through shrink_mmap(), where cached state gets
dropped. this will slow things down.
i also believe that a multithreaded page cache for file data won't help
much if the file system is still serialized :)
- Chuck Lever
--
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The Linux Scalability project:
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