From: David Mosberger <davidm@napali.hpl.hp.com>
To: Andrew Morton <akpm@osdl.org>
Cc: jbarnes@sgi.com (Jesse Barnes),
axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] backing dev unplugging
Date: Wed, 10 Mar 2004 16:03:55 -0800 [thread overview]
Message-ID: <16463.44267.253785.644266@napali.hpl.hp.com> (raw)
In-Reply-To: <20040310155419.550c4a6a.akpm@osdl.org>
>>>>> On Wed, 10 Mar 2004 15:54:19 -0800, Andrew Morton <akpm@osdl.org> said:
Andrew> jbarnes@sgi.com (Jesse Barnes) wrote:
>>
>> -------------------------------------
>> w/Jens' patch: ~47149 I/Os per second
Andrew> Happier.
>> [root@revenue sio]# readprofile -m /root/System.map | sort -nr +2
>> | head -20 181993 default_idle 5687.2812 624772 snidle 1627.0104
>> 209129 cpu_idle 435.6854 4755 dio_bio_end_io 12.3828 6593
>> scsi_end_request 12.1195 435 ia64_spinlock_contention 6.7969 2959
>> sn_dma_flush 4.4033
Andrew> Do you know where that spinlock contention is coming from?
Andrew> (We have a little patch for x86 which places the spinning
Andrew> code inline in the caller of spin_lock() so it appears
Andrew> nicely in profiles.)
And real men use profiling tools that provide a call-graph, so this
hack isn't necessary... ;-)
Jesse, if you want to try q-tools and need some help in getting the
per-CPU results merged, let me know (it's something that's planned for
a future release, but there is only so many hours in a day so this
hasn't been done yet).
--david
next prev parent reply other threads:[~2004-03-11 0:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-10 12:45 Jens Axboe
2004-03-10 19:55 ` Andrew Morton
2004-03-10 20:03 ` Kenneth Chen
2004-03-10 20:20 ` Jens Axboe
2004-03-10 20:45 ` Jesse Barnes
2004-03-10 20:49 ` Jens Axboe
[not found] ` <20040310205237.GK15087@suse.de>
2004-03-10 21:01 ` Jesse Barnes
2004-03-10 21:02 ` Jens Axboe
2004-03-10 21:35 ` Jesse Barnes
2004-03-10 23:54 ` Andrew Morton
2004-03-11 0:03 ` David Mosberger [this message]
2004-03-11 6:30 ` Jesse Barnes
2004-03-10 20:17 ` Jens Axboe
2004-03-15 5:53 ` Kenneth Chen
2004-03-10 20:14 ` Jeff Garzik
2004-03-10 20:19 ` Jens Axboe
2004-03-10 21:00 ` Andrew Morton
2004-03-10 21:02 ` Jens Axboe
2004-03-10 21:40 ` Miquel van Smoorenburg
2004-03-10 23:05 ` Andrew Morton
2004-03-11 0:05 ` Miquel van Smoorenburg
2004-03-11 0:17 ` Andrew Morton
2004-03-11 6:43 ` Jens Axboe
2004-03-10 22:22 ` Nathan Scott
2004-03-10 23:32 ` Steve Lord
2004-03-11 7:05 ` Jens Axboe
2004-03-11 9:14 ` Joe Thornber
2004-03-11 9:16 ` Jens Axboe
2004-03-11 12:17 ` Christophe Saout
2004-03-11 12:22 ` Jens Axboe
2004-03-11 13:11 ` Christophe Saout
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