linux-kernel - Re: [RFC PATCH 2/3] sched: add yield

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Date:	Mon, 3 Jan 2011 12:18:41 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Edwin Zhai <edwin.zhai@...el.com>
Subject: Re: [RFC PATCH 2/3] sched: add yield_to function

On Mon, Jan 3, 2011 at 1:19 AM, Rik van Riel <riel@...hat.com> wrote:
> On 01/02/2011 06:43 AM, Hillf Danton wrote:
>
>> The following work is based on what Rik posted, with a few changes.
>
> I threw out my patch before Christmas, replacing it with
> Mike Galbraith's work.
>

Would you please share the work by Mike, or info where to get it?

Hillf

> Today I finally discovered why I had not been getting
> very useful results testing the PLE code on the test
> system.
>
> On this particular CPU model (Intel(R) Xeon(R) CPU X5670),
> the value of ple_gap needs to be at least 48 !
>
> A ple_gap value of 41 is simply too low to trigger reliably
> with Avi's kvm-unit-tests PLE test and also only triggers
> a few times a second at most (not too useful) with the other
> tests I had been running...
>
> --
> All rights reversed
>
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