linux-kernel - RE: Mainline kernel OLTP performance update

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Date:	Thu, 15 Jan 2009 12:44:16 -0700
From:	"Ma, Chinang" <chinang.ma@...el.com>
To:	"Wilcox, Matthew R" <matthew.r.wilcox@...el.com>,
	Gregory Haskins <ghaskins@...ell.com>,
	Steven Rostedt <srostedt@...hat.com>
CC:	Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"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>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Chilukuri, Harita" <harita.chilukuri@...el.com>,
	"Styner, Douglas W" <douglas.w.styner@...el.com>,
	"Wang, Peter Xihong" <peter.xihong.wang@...el.com>,
	"Nueckel, Hubert" <hubert.nueckel@...el.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	Andrew Vasquez <andrew.vasquez@...gic.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: RE: Mainline kernel OLTP performance update

Gregory. 
I will test the resched-ipi instrumentation patch with our OLTP if you can post the patch and some instructions.
Thanks,
-Chinang

>-----Original Message-----
>From: Wilcox, Matthew R
>Sent: Thursday, January 15, 2009 10:47 AM
>To: Gregory Haskins; Steven Rostedt
>Cc: Matthew Wilcox; Andrew Morton; James Bottomley; Ma, Chinang; linux-
>kernel@...r.kernel.org; Tripathi, Sharad C; arjan@...ux.intel.com; Kleen,
>Andi; Siddha, Suresh B; Chilukuri, Harita; Styner, Douglas W; Wang, Peter
>Xihong; Nueckel, Hubert; chris.mason@...cle.com; linux-scsi@...r.kernel.org;
>Andrew Vasquez; Anirban Chakraborty
>Subject: RE: Mainline kernel OLTP performance update
>
>Gregory Haskins [mailto:ghaskins@...ell.com] wrote:
>> > On Thu, 2009-01-15 at 11:00 -0700, Matthew Wilcox wrote:
>> >> So if the reschedule interrupt is happening twice as often, and the
>> >> context switch rate is basically unchanged, I guess that means the
>> >> scheduler is doing a lot more work to get approximately the same
>> >> results.  And that seems like a bad thing.
>>
>> I would be very interested in gathering some data in this area.  One
>> thing that pops to mind is to instrument the resched-ipi with
>> ftrace_printk() and gather a trace of this system in action.  I assume
>> that I wouldn't have access to this OLTP suite, so I may need a
>> volunteer to try this for me.  I could put together an instrumentation
>> patch for the testers convenience if they prefer.
>
>I don't know whether Novell have an arrangement with the Well-Known
>Commercial Database and the Well-Known OLTP Benchmark to do runs like this.
>Chinang is normally only too happy to build his own kernels with patches
>from people who are interested in helping, so that's probably the best way
>to do it.
>
>I'm leaving for LCA in an hour or so, so further responses from me to this
>thread are unlikely ;-)
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