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

[Tim Chen]

On Tue, 2014-07-29 at 17:12 -0700, Christoph Hellwig wrote:
> 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.
> 

Yes, please put in 

Tested-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Tested-by: Suruchi Kadu <suruchi.a.kadu@xxxxxxxxx>

Tim

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