Re: [PATCH] md:Add blk_plug in sync_thread.

[Nagilum <nagilum@xxxxxxxxxxx>]

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!! :)

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