linux-kernel - RE: Mainline kernel OLTP performance update

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Date:	Wed, 29 Apr 2009 11:25:43 -0700
From:	"Styner, Douglas W" <douglas.w.styner@...el.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Chris Mason <chris.mason@...cle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Tripathi, Sharad C" <sharad.c.tripathi@...el.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Ma, Chinang" <chinang.ma@...el.com>,
	"Wang, Peter Xihong" <peter.xihong.wang@...el.com>,
	"Nueckel, Hubert" <hubert.nueckel@...el.com>,
	"Recalde, Luis F" <luis.f.recalde@...el.com>,
	"Nelson, Doug" <doug.nelson@...el.com>,
	"Cheng, Wu-sun" <wu-sun.cheng@...el.com>,
	"Prickett, Terry O" <terry.o.prickett@...el.com>,
	"Shunmuganathan, Rajalakshmi" <rajalakshmi.shunmuganathan@...el.com>,
	"Garg, Anil K" <anil.k.garg@...el.com>,
	"Chilukuri, Harita" <harita.chilukuri@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: RE: Mainline kernel OLTP performance update

Pallipadi, Venkatesh writes:
>Output of
># grep . /sys/devices/system/cpu/cpu0/cpufreq/*
>can tell us whether P-state software coordination is the reason behind
>excessive resched IPIs. Look for ondemand being the current_governor and
>affected_cpus containing more than one CPU in it.

On these setups, we are disabling frequency scaling at the bios. 
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