From: Dave Chinner <david@fromorbit.com>
To: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Cc: Vivek Goyal <vgoyal@redhat.com>, Jens Axboe <jaxboe@fusionio.com>,
linux-kernel@vger.kernel.org
Subject: Re: fio posixaio performance problem
Date: Wed, 3 Aug 2011 14:06:13 +1000 [thread overview]
Message-ID: <20110803040613.GJ12870@dastard> (raw)
In-Reply-To: <4E38C314.8070305@cn.fujitsu.com>
On Wed, Aug 03, 2011 at 11:40:04AM +0800, Gui Jianfeng wrote:
> Hi,
>
> I ran a fio test to simulate qemu-kvm io behaviour.
> When job number is greater than 2, IO performance is
> really bad.
>
> 1 thread: aggrb=15,129KB/s
> 4 thread: aggrb=1,049KB/s
>
> Kernel: lastest upstream
>
> Any idea?
>
> ---
> [global]
> runtime=30
> time_based=1
> size=1G
> group_reporting=1
> ioengine=posixaio
> exec_prerun='echo 3 > /proc/sys/vm/drop_caches'
> thread=1
>
> [kvmio-1]
> description=kvmio-1
> numjobs=4
> rw=write
> bs=4k
> direct=1
> filename=/mnt/sda4/1G.img
What filesystem?
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2011-08-03 4:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-03 3:40 fio posixaio performance problem Gui Jianfeng
2011-08-03 4:06 ` Dave Chinner [this message]
2011-08-03 4:47 ` Gui Jianfeng
2011-08-03 5:12 ` Gui Jianfeng
2011-08-03 7:38 ` Shaohua Li
2011-08-03 8:11 ` Gui Jianfeng
2011-08-03 8:22 ` Shaohua Li
2011-08-03 9:48 ` Gui Jianfeng
2011-08-03 15:45 ` Vivek Goyal
2011-08-03 17:51 ` Vivek Goyal
2011-08-04 0:53 ` Shaohua Li
2011-08-04 2:00 ` Gui Jianfeng
2011-08-04 3:14 ` Shaohua Li
[not found] ` <4E3A4DF7.3020605@cn.fujitsu.com>
2011-08-04 8:25 ` Shaohua Li
2011-08-04 8:35 ` Gui Jianfeng
2011-08-04 9:01 ` Jens Axboe
2011-08-04 14:12 ` Vivek Goyal
2011-08-05 0:56 ` Gui Jianfeng
2011-08-05 1:31 ` Gui Jianfeng
2011-08-04 1:55 ` Gui Jianfeng
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