Re: 2.6.12-rc6-mm1

[Martin J. Bligh]

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

> Christoph Lameter <clameter@xxxxxxxxxxxx> 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.

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