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

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Message-ID: <4D20B38B.40007@redhat.com>
Date:	Sun, 02 Jan 2011 12:19:07 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Hillf Danton <dhillf@...il.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 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.

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...

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