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SubjectRe: Mainline kernel OLTP performance update
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On Tue, 2009-04-28 at 12:57 -0400, Chuck Ebbert wrote:
> On Mon, 27 Apr 2009 09:02:40 +0200
> Andi Kleen <andi@firstfloor.org> wrote:
>
> > "Styner, Douglas W" <douglas.w.styner@intel.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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