From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nagilum <nagilum@nagilum.org>
Subject: Re: [PATCH] md:Add blk_plug in sync_thread.
Date: Mon, 11 Jun 2012 12:30:14 +0200
Message-ID: <4FD5C8B6.1050009@nagilum.org>
References: <201206111716521256611@gmail.com>,  <4FD5BB39.4040406@nagilum.org> <201206111811008288882@gmail.com>
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To: majianpeng <majianpeng@gmail.com>
Cc: Neil Brown <neilb@suse.de>, linux-raid <linux-raid@vger.kernel.org>
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On 06/11/2012 12:11 PM, majianpeng wrote:
> On Mon, 11 Jun 2012 02:32:57 najilum wrote:
>> On 06/11/2012 11:16 AM, majianpeng wrote:
>>> Add blk_plug in sync_thread will increase the performance of sync.
>>> Because sync_thread did not blk_plug,so when raid sync, the bio merge
>>> not well.
>>>
>>> Testing environment:
>>> SATA controller: Intel Corporation 82801JI (ICH10 Family) SATA AHCI
>>> Controller.
>>> OS:Linux xxx 3.5.0-rc2+ #340 SMP Tue Jun 12 09:00:25 CST 2012
>>> x86_64 x86_64 x86_64 GNU/Linux.
>>> RAID5: four ST31000524NS disk.
>>>
>>> Without blk_plug:recovery speed about 63M/Sec;
>>> Add blk_plug:recovery speed about 120M/Sec.
>> Whahoo!! :)
> What's mean ? 
Almost doubled the performance with one simple change, that's great! :)