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From: Jeff Moyer <jmoyer@redhat.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Corrado Zoccolo <czoccolo@gmail.com>,
	axboe@kernel.dk, Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/2] cfq-iosched: fixing RQ_NOIDLE handling.
Date: Tue, 13 Jul 2010 17:00:16 -0400	[thread overview]
Message-ID: <x49630jp067.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <x49aapvp1k0.fsf@segfault.boston.devel.redhat.com> (Jeff Moyer's message of "Tue, 13 Jul 2010 16:30:23 -0400")

Jeff Moyer <jmoyer@redhat.com> writes:

> This, of course, raises the question of why the blk_yield patches didn't
> run into the same problem.  Looking back at some saved traces, I don't
> see WBS (write barrier sync) requests, so I wonder if barriers weren't
> supported by my last storage system.

So, I tested Corrado's approach with -o nobarrier, and here are the
results:

fs_mark: 363.291 files/sec
fio: 38.5 MB/s

I don't have time to analyze the data right now, and it's 600MB worth of
binary output.  If you want, I can upload a representative sample
somewhere, let me know.

Anyway, I'll post an analysis tomorrow.

Cheers,
Jeff

  parent reply	other threads:[~2010-07-13 21:00 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-07 15:22 Corrado Zoccolo
2010-07-07 15:56 ` Corrado Zoccolo
2010-07-07 17:03 ` Jeff Moyer
2010-07-07 17:39   ` Corrado Zoccolo
2010-07-07 20:06     ` Jeff Moyer
2010-07-08 14:38       ` Corrado Zoccolo
2010-07-09 10:33       ` Corrado Zoccolo
2010-07-09 13:23         ` Vivek Goyal
2010-07-09 14:07         ` Jeff Moyer
2010-07-09 19:45           ` Corrado Zoccolo
2010-07-09 20:48             ` Jeff Moyer
2010-07-13 19:38         ` Jeff Moyer
2010-07-13 19:56           ` Vivek Goyal
2010-07-13 20:30             ` Jeff Moyer
2010-07-13 20:42               ` Vivek Goyal
2010-07-19 16:08                 ` Jeff Moyer
2010-07-19 20:31                   ` Vivek Goyal
2010-07-20 14:02                     ` Jeff Moyer
2010-07-20 14:11                   ` Christoph Hellwig
2010-07-20 14:26                     ` Vivek Goyal
2010-07-20 19:10                       ` Corrado Zoccolo
2010-07-20 19:32                         ` Vivek Goyal
2010-07-13 21:00               ` Jeff Moyer [this message]
2010-07-07 17:50   ` Vivek Goyal
2010-07-08 14:35   ` Vivek Goyal
2010-07-08 14:38     ` Jeff Moyer
2010-07-08 14:45     ` Corrado Zoccolo

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