linux-kernel - Re: Interesting interaction between lguest and CFS

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Message-ID: <20070605190806.GA18503@elte.hu>
Date:	Tue, 5 Jun 2007 21:08:06 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, akpm@...ux-foundation.org,
	Linux-kernel@...r.kernel.org
Subject: Re: Interesting interaction between lguest and CFS

* Ingo Molnar <mingo@...e.hu> wrote:

> Matt, could you send me your .config too? Maybe i can reproduce it 
> with your config.

ok, got it (off-list) and you seem to have the default HZ=250. Could you 
change it to HZ=1000 - does the delay get alot smaller?

if yes then this could be roughly the expected worst-case behavior for a 
nice+19 'signalling' task - i'd suggest to try the dont-use-renice patch 
Rusty sent (with the hang it causes fixed), or to change the nice(19) to 
nice(10).

(the rq_clock behavior still looks a bit anomalous, that perhaps 
contributes to the problem.)

	Ingo
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