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From: Bart Van Assche <bvanassche@acm.org>
Date: Mon, 18 Apr 2011 20:32:43 +0200
Message-ID: <BANLkTimaekpwmK+z=ePE+XSP6GUteidwfw@mail.gmail.com>
Subject: Re: [Bug #32982] Kernel locks up a few minutes after boot
To: Jens Axboe <jaxboe@fusionio.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        "Rafael J. Wysocki" <rjw@sisk.pl>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kernel Testers List <kernel-testers@vger.kernel.org>,
        Maciej Rutecki <maciej.rutecki@gmail.com>,
        Florian Mickler <florian@mickler.org>, Neil Brown <neilb@suse.de>
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On Mon, Apr 18, 2011 at 8:28 PM, Jens Axboe <jaxboe@fusionio.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

Bart.
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