linux-kernel - Re: 1be41b78: +18% increased btrfs write throughput

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Message-ID: <1388765265.32640.7.camel@ret.masoncoding.com>
Date:	Fri, 3 Jan 2014 16:07:05 +0000
From:	Chris Mason <clm@...com>
To:	"fengguang.wu@...el.com" <fengguang.wu@...el.com>
CC:	"jbacik@...ionio.com" <jbacik@...ionio.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"lkp@...ux.intel.com" <lkp@...ux.intel.com>
Subject: Re: 1be41b78: +18% increased btrfs write throughput

On Fri, 2014-01-03 at 23:54 +0800, fengguang.wu@...el.com wrote:
> Hi Josef,
> 
> FYI. We are doing 0day performance tests and happen to notice that
> btrfs write throughput increased considerably during v3.10-11 time
> frame:
> 
>           v3.10                      v3.11                      v3.12                  v3.13-rc6
> ---------------  -------------------------  -------------------------  -------------------------
>      50619 ~ 1%     +17.0%      59209 ~ 2%     +18.8%      60159 ~ 2%     +20.5%      61007 ~ 0%  lkp-ws02/micro/dd-write/11HDD-JBOD-cfq-btrfs-1dd
>      50619          +17.0%      59209          +18.8%      60159          +20.5%      61007       TOTAL iostat.sdd.wkB/s
> 
> and it's contributed by 
> 
> commit 1be41b78bc688fc634bf30965d2be692c99fd11d
> Author:     Josef Bacik <jbacik@...ionio.com>
> AuthorDate: Wed Jun 12 13:56:06 2013 -0400
> Commit:     Josef Bacik <jbacik@...ionio.com>
> CommitDate: Mon Jul 1 08:52:28 2013 -0400
> 
>     Btrfs: fix transaction throttling for delayed refs

Bonus points for increasing the performance on purpose.  Thanks for
running these Wu.

-chris

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