linux-kernel - RE: Mainline kernel OLTP performance update

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Date:	Wed, 29 Apr 2009 10:52:26 -0700
From:	"Styner, Douglas W" <douglas.w.styner@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"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>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: RE: Mainline kernel OLTP performance update

Peter Ziljstra writes:
>
>I've had several reports about the resched-ipi going in overdrive, but
>nobody bothered to bisect it, nor have I yet done so -- no clear ideas
>on why it is doing so.
>
>I'll put it somewhere higher on the todo list.

FWIW, here is the interrupt data I was referring to.  The kernel delta refers to the difference in /proc/interrupts between the start and end of the run.  All database processes are running SCHED_RR.

                               2.6.24.2   2.6.30-rc3 
                                 delta       delta    % change
PCI-MSI-edge    qla2xxx         5270060     6118088      16.1%
PCI-MSI-edge    qla2xxx         5630742     5439656      -3.4%
PCI-MSI-edge    qla2xxx         5836425     5938014       1.7%
PCI-MSI-edge    qla2xxx         5774269     6007126       4.0%
PCI-MSI-edge    qla2xxx         5239457     5774888      10.2%
PCI-MSI-edge    qla2xxx         5965193     5424013      -9.1%
PCI-MSI-edge    eth0           31404141    32443614       3.3%
PCI-MSI-edge    eth1               1754        1453     -17.2%
Non-maskable interrupts        14041623    12980424      -7.6%
Local timer interrupts         27948168    28911532       3.4%
Rescheduling interrupts         1905119     4226516     121.9%
Function call interrupts            210          49     -76.7%
TLB shootdowns                      684        1455     112.7%

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