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From: Ed Tomlinson <edt@aei.ca>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] CFS scheduler, -v19
Date: Mon, 16 Jul 2007 11:10:08 +0000
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Cc: linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Mike Galbraith <efault@gmx.de>, Arjan van de Ven <arjan@infradead.org>,
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       Dmitry Adamushko <dmitry.adamushko@gmail.com>,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
References: <20070706173319.GA2356@elte.hu> <200707141319.13270.edt@aei.ca> <20070716091737.GB5964@elte.hu>
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On Monday 16 July 2007 05:17, Ingo Molnar wrote:
> 
> * Ed Tomlinson <edt@aei.ca> wrote:
> 
> > I run a java application at nice 15.  Its been a background 
> > application here for as long as SD and CFS have been around.  If I 
> > have a compile running at nice 0, with v19 java gets so little cpu 
> > that the the wrapper that runs to monitor it is timing out waiting for 
> > it to start.  This is new in v19 - something in v19 is not meshing 
> > well with my mix of applications...
> 
> how much longer did the startup of the java app get relative to say v18?
> 
> to debug this, could you check whether this problem goes away if you use 
> nice 10 (or nice 5) instead of nice 15?

Ingo,

It may take a day to two before I get to test this. I have had to revert to 2.6.21 -
it seems that 22 triggers a stall here (21 also can trigger this but its harder)...

Thanks
Ed