linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Tue, 28 Apr 2009 17:15:47 +0000
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Styner, Douglas W" <douglas.w.styner@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-driver@...gic.com, linux-scsi@...r.kernel.org
Subject: Re: Mainline kernel OLTP performance update

On Tue, 2009-04-28 at 12:57 -0400, Chuck Ebbert wrote:
> On Mon, 27 Apr 2009 09:02:40 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > "Styner, Douglas W" <douglas.w.styner@...el.com> writes:
> > 
> > >
> > > ======oprofile 0.9.3 CPU_CLK_UNHALTED for top 30 functions
> > > Cycles% 2.6.24.2                   Cycles% 2.6.30-rc2
> > > 74.8578 <database>                   67.6966 <database>
> > 
> > The dip in database cycles is indeed worrying.
> > 
> > > 1.0500 qla24xx_start_scsi          1.1724 qla24xx_start_scsi
> > > 0.8089 schedule                    1.0578 qla24xx_intr_handler
> > > 0.5864 kmem_cache_alloc            0.8259 __schedule
> > > 0.4989 __blockdev_direct_IO        0.7451 kmem_cache_alloc
> > > 0.4357 __sigsetjmp                 0.4872 __blockdev_direct_IO
> > > 0.4152 copy_user_generic_string    0.4390 task_rq_lock
> > > 0.3953 qla24xx_intr_handler        0.4338 __sigsetjmp
> > 
> > And also why the qla24xx_intr_handler became ~2.5x as expensive.
> > Cc linux-scsi and qla24xx maintainers.
> > 
> 
> They are getting 31000 interrupts/sec vs. 22000/sec on older kernels.

Should be fixed by:

http://marc.info/?l=linux-scsi&m=124093712114937

If someone could verify, I'd be grateful.

Thanks,

James


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