RE: Mainline kernel OLTP performance update

Ma, Chinang
2009-01-15T19:44:27Z

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@vger.kernel.org; Tripathi, Sharad C; arjan@linux.intel.com; Kleen,
>Andi; Siddha, Suresh B; Chilukuri, Harita; Styner, Douglas W; Wang, Peter
>Xihong; Nueckel, Hubert; chris.mason@oracle.com; linux-scsi@vger.kernel.org;
>Andrew Vasquez; Anirban Chakraborty
>Subject: RE: Mainline kernel OLTP performance update
>
>Gregory Haskins [mailto:ghaskins@novell.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 ;-)