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

From: Christoph Hellwig
Date: Tue Jul 29 2014 - 20:12:56 EST

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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