From: Christoph Hellwig <hch@infradead.org>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: Heinz Diehl <htd@fancy-poultry.org>,
linux-kernel@vger.kernel.org, jaxboe@fusionio.com,
nauman@google.com, dpshah@google.com, guijianfeng@cn.fujitsu.com,
jmoyer@redhat.com, czoccolo@gmail.com
Subject: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group_idle tunable
Date: Wed, 28 Jul 2010 19:57:16 -0400 [thread overview]
Message-ID: <20100728235716.GA12945@infradead.org> (raw)
In-Reply-To: <20100728202212.GD16314@redhat.com>
On Wed, Jul 28, 2010 at 04:22:12PM -0400, Vivek Goyal wrote:
> I also did "time firefox &" testing to see how long firefox takes to
> launch when linus torture test is running and without patch it took
> around 20 seconds and with patch it took around 17 seconds.
>
> So to me above test results suggest that this patch does not worsen
> the performance. In fact it helps. (at least on ext3 file system.)
>
> Not sure why are you seeing different results with XFS.
So why didn't you test it with XFS to verify his results? We all know
that different filesystems have different I/O patters, and we have
a history of really nasty regressions in one filesystem by good meaning
changes to the I/O scheduler.
ext3 in fact is a particularly bad test case as it not only doesn't have
I/O barriers enabled, but also has particularly bad I/O patterns
compared to modern filesystems.
next prev parent reply other threads:[~2010-07-28 23:57 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-22 21:29 [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group_idle tunable Vivek Goyal
2010-07-22 21:29 ` [PATCH 1/5] cfq-iosched: Do not idle on service tree if slice_idle=0 Vivek Goyal
2010-07-22 21:29 ` [PATCH 2/5] cfq-iosched: Implment IOPS mode for group scheduling Vivek Goyal
2010-07-27 5:47 ` Gui Jianfeng
2010-07-27 13:09 ` Vivek Goyal
2010-07-22 21:29 ` [PATCH 3/5] cfq-iosched: Implement a tunable group_idle Vivek Goyal
2010-07-22 21:29 ` [PATCH 4/5] cfq-iosched: Print number of sectors dispatched per cfqq slice Vivek Goyal
2010-07-22 21:29 ` [PATCH 5/5] cfq-iosched: Documentation update Vivek Goyal
2010-07-22 21:36 ` Randy Dunlap
2010-07-23 20:22 ` Vivek Goyal
2010-07-23 14:03 ` [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group_idle tunable Heinz Diehl
2010-07-23 14:13 ` Vivek Goyal
2010-07-23 14:56 ` Heinz Diehl
2010-07-23 18:37 ` Vivek Goyal
2010-07-24 8:06 ` Heinz Diehl
2010-07-26 13:43 ` Vivek Goyal
2010-07-26 13:48 ` Christoph Hellwig
2010-07-26 13:54 ` Vivek Goyal
2010-07-26 16:15 ` Heinz Diehl
2010-07-26 14:13 ` Christoph Hellwig
2010-07-27 7:48 ` Heinz Diehl
2010-07-28 20:22 ` Vivek Goyal
2010-07-28 23:57 ` Christoph Hellwig [this message]
2010-07-29 4:34 ` cfq fsync patch testing results (Was: Re: [RFC PATCH] cfq-iosched: IOPS mode for group scheduling and new group_idle tunable) Vivek Goyal
2010-07-29 14:56 ` Vivek Goyal
2010-07-29 19:39 ` Jeff Moyer
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