Re: 2.6.21-rc3-mm1 RSDL results

[Con Kolivas <kernel@kolivas.org>]

On Saturday 10 March 2007 09:29, Matt Mackall wrote:
> On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote:
> > On Saturday 10 March 2007 08:57, Con Kolivas wrote:
> > > On Saturday 10 March 2007 08:39, Matt Mackall wrote:
> > > > So what's different between makes in parallel and make -j 5? Make's
> > > > job server uses pipe I/O to control how many jobs are running.
> > >
> > > Hmm it must be those deep pipes again then. I removed any quirks
> > > testing for those from mainline as I suspected it would be ok. Guess
> > > I"m wrong.
> >
> > I shouldn't blame this straight up though if NO_HZ makes it better.
> > Something else is going wrong... wtf though?
>
> Just so we're clear, dynticks has only 'fixed' the single non-parallel
> make load so far.

Ok, back to the pipe idea. Without needing a kernel recompile, can you try 
running the make -j5 as a SCHED_BATCH task?

This wrapper will make it possible:
http://freequaos.host.sk/schedtool/schedtool-1.2.9.tar.bz2

then
schedtool -B -e make -j5

If that helps it gives me something to work with.

-- 
-ck