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

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Message-ID: <20140730001248.GA32367@infradead.org>
Date:	Tue, 29 Jul 2014 17:12:48 -0700
From:	Christoph Hellwig <hch@...radead.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>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [Regression 3.16-rc kernel] -55% reduction in throughput for
 OLTP benchmark

On Tue, Jul 29, 2014 at 04:57:12PM -0700, Tim Chen wrote:
> Christoph, we're glad to report that this patch does fix the problem.
> Wonder if Al or someone can pick it up.  It is a large regression
> that should not be left unfixed for 3.16.

Al has been away for a bit, and I prepared the last VFS pull.  I'll pick
it up for now and either Al or I will send it on before next weekend.

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.

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