From: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
To: Shaohua Li <shli@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>, Jens Axboe <jaxboe@fusionio.com>,
linux-kernel@vger.kernel.org
Subject: Re: fio posixaio performance problem
Date: Wed, 03 Aug 2011 16:11:51 +0800 [thread overview]
Message-ID: <4E3902C7.9050907@cn.fujitsu.com> (raw)
In-Reply-To: <CANejiEViuKky1A7Xh0MQKBVNMj_fgzwayWyON7hFGfP3wa62SQ@mail.gmail.com>
On 2011-8-3 15:38, Shaohua Li wrote:
> 2011/8/3 Gui Jianfeng <guijianfeng@cn.fujitsu.com>:
>> 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
> Hmm, the test runs always about 15M/s at my side regardless how many threads.
CFQ？
what's the slice_idle value?
Thanks,
Gui
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next prev parent reply other threads:[~2011-08-03 8:11 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
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 [this message]
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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