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

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Message-ID: <1406651702.2970.927.camel@schen9-DESK>
Date:	Tue, 29 Jul 2014 09:35:02 -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 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.

Tim

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