linux-kernel - Re: [Bug #32982] Kernel locks up a few minutes after boot

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Message-ID: <4DAC853C.5070509@fusionio.com>
Date:	Mon, 18 Apr 2011 20:38:52 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Bart Van Assche <bvanassche@....org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Florian Mickler <florian@...kler.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: [Bug #32982] Kernel locks up a few minutes after boot

On 2011-04-18 20:32, Bart Van Assche wrote:
> On Mon, Apr 18, 2011 at 8:28 PM, Jens Axboe <jaxboe@...ionio.com> wrote:
>> On 2011-04-18 20:21, Bart Van Assche wrote:
>>> a performance regression in the block layer not related to the md
>>> issue. If I run a small block IOPS test on a block device created by
>>> ib_srp (NOOP scheduler) I see about 11% less IOPS than with 2.6.38.3
>>> (155.000 IOPS with 2.6.38.3 and 140.000 IOPS with 2.6.39-rc3+).
>>
>> That's not good. What's the test case?
> 
> Nothing more than a fio IOPS test:
> 
> fio --bs=512 --ioengine=libaio --buffered=0 --rw=read --thread
> --iodepth=64 --numjobs=2 --loops=10000 --group_reporting --size=1G
>     --gtod_reduce=1 --name=iops-test --filename=/dev/${dev} --invalidate=1

Interesting, I'll have to check if we regressed with all these recent
changes. Comparing your .38 to .39-rc3+, are you using more/less CPU,
more/less sys%, etc?

A quick perf record -fg / perf report -g for both kernels would be nice
to see.

-- 
Jens Axboe

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