Re: Terrible interactivity with 2.6.0-t9-mm3

Gene Heskett
2003-11-17T03:54:27Z

On Sunday 16 November 2003 21:49, Andrew Morton wrote:
>Gawain Lynch <gawain@freda.homelinux.org> wrote:
>> On Mon, 2003-11-17 at 08:42, Andrew Morton wrote:
>> > Two things to try, please:
>> >
>> > a) Is the problem from Linus's tree? Try 2.6.0-test9 plus
>> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2
>> >.6.0-test9/2.6.0-test9-mm3/broken-out/linus.patch
>> >
>> > b) The only significant scheduler change in mm3 was
>> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2
>> >.6.0-test9/2.6.0-test9-mm3/broken-out/context-switch-accounting-f
>> >ix.patch
>> >
>> > So please try -mm3 with the above patch reverted with
>> >
>> > patch -R -p1 < context-switch-accounting-fix.patch
>>
>> Hi Andrew,
>>
>> This is also easily reproducible here with just a kernel compile.
>>
>> I have tried both a) and b) with b) not changing anything, but a)
>> seems to work... Anything more to try?
>
>Your report has totally confused me. Are you saying that the
> jerkiness is caused by linus.patch? Or not? Pleas try again ;)

In defense of this code, I ran -mm3 with the deadline elevator for
about 3 days and was very happy with the interactivity. Now I've
been running with the elevator=cfq for most of the day, and it also
seems to be pretty responsive. The default as wasn't, at least for
-mm2, and I haven't tried it yet for -mm3. Should I, and report back
in a day or so so that you've got reports from an otherwise identical
system to compare?

We need a test suite for this :)

--
Cheers, Gene
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