linux-kernel - Re: [Regression 3.16-rc kernel] -55% reduction in throughput for OLTP benchmark

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Date:	Thu, 31 Jul 2014 10:07:55 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	suruchi <suruchi.a.kadu@...el.com>, ak <ak@...ux.intel.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"hubert.nueckel" <hubert.nueckel@...el.com>,
	beth.marsh-prime@...el.com, "doug.nelson" <doug.nelson@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [Regression 3.16-rc kernel] -55% reduction in throughput for OLTP benchmark

On Thu, Jul 31, 2014 at 9:13 AM, Tim Chen <tim.c.chen@...ux.intel.com> wrote:
> On Tue, 2014-07-29 at 17:12 -0700, Christoph Hellwig wrote:
>>
>> Can I get a tested-by tag from you for the patch?  Can anyone else
>> please cross check it?  The new total value might be different from
>> the old size value when we do a short write, but I can't see how
>> an async write would be a good thing if we had to finish the remainder
>> using buffered I/O if the old code really allowed that.
>>
>
> Yes, please put in
>
> Tested-by: Tim Chen <tim.c.chen@...ux.intel.com>
> Tested-by: Suruchi Kadu <suruchi.a.kadu@...el.com>

Ok, good, patch looks fine. Christoph, do you have a commit message for it?

              Linus
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