Re: 2.6.12-rc6-mm1

Martin J. Bligh
2005-06-08T14:15:42Z

--Andrew Morton <akpm@osdl.org> wrote (on Tuesday, June 07, 2005 17:08:53 -0700):

> Christoph Lameter <clameter@engr.sgi.com> wrote:
>>
>> On Tue, 7 Jun 2005, Andrew Morton wrote:
>>
>> > > Diffprofile is wacko (HZ seems to be defaulting to 250 in -mm).
>> >
>> > Oh crap, so it does. That's wrong.
>>
>> Email by you and Linus indicated that 250 should be the default.
>
> Oh, OK. hrm.
>
> Martin, it would be useful if you could determine whether the kernbench
> slowdown was due to the 1000Hz->250Hz change, thanks.
>
> I'm assuming it was the CPU scheduler patches. There are 36 of them ;)

Is actually worse with HZ=1000 ... so I think we still have another problem,
probably with scheduler patches. (the one marked -mm1+p4947 in blue is the
patched one)

http://ftp.kernel.org/pub/linux/kernel/people/mbligh/abat/perf/kernbench.moe.png

I can back out various patches ... are all the scheduler patches starting
in sched.* or something equally obvious? if not, a list of what to blat
would help me ... or I'll do a crapshoot, and see what falls out ;-)

M.