From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [Regression 3.16-rc kernel] -55% reduction in throughput for
 OLTP benchmark
Date: Tue, 29 Jul 2014 17:12:48 -0700
Message-ID: <20140730001248.GA32367@infradead.org>
References: <1406584299.2970.924.camel@schen9-DESK>
 <20140729141908.GA4464@infradead.org>
 <1406651702.2970.927.camel@schen9-DESK>
 <20140729164951.GA23863@infradead.org>
 <1406678232.2970.943.camel@schen9-DESK>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Christoph Hellwig <hch@infradead.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	suruchi <suruchi.a.kadu@intel.com>, ak <ak@linux.intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Matthew Wilcox <willy@linux.intel.com>,
	"hubert.nueckel" <hubert.nueckel@intel.com>,
	beth.marsh-prime@intel.com, "doug.nelson" <doug.nelson@intel.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <1406678232.2970.943.camel@schen9-DESK>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

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.