Re: Mainline kernel OLTP performance update

Chuck Ebbert
2009-04-28T16:57:16Z

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.