linux-kernel - Re: Mainline kernel OLTP performance update

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Date:	Mon, 27 Apr 2009 09:02:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Styner, Douglas W" <douglas.w.styner@...el.com>
Cc:	"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

"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.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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