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

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Date:	Tue, 29 Jul 2014 10:41:57 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	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 Tue, 2014-07-29 at 09:49 -0700, Christoph Hellwig wrote:
> On Tue, Jul 29, 2014 at 09:35:02AM -0700, Tim Chen wrote:
> > On Tue, 2014-07-29 at 07:19 -0700, Christoph Hellwig wrote:
> > > Hi Tim,
> > > 
> > > I think the problem is that sdio.size doesn't get set set with
> > > the new dio code.  Please try the patch below to fix this by not
> > > relying on that field:
> > 
> > Thanks for your quick response.  We'll test this patch and let you
> > know the results.
> 
> There actually was a little bug in it, please try the version below
> instead:
> 

Thanks.  Will do.

Tim

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