linux-kernel - Re: [PATCH 1/1] fat: improve sync performance by grouping writes revised

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Message-ID: <f46018bb0610311046t6aa969ccy60a2020f7e5a0ed9@mail.gmail.com>
Date:	Tue, 31 Oct 2006 13:46:46 -0500
From:	"Holden Karau" <holden@...scanfly.ca>
To:	"OGAWA Hirofumi" <hirofumi@...l.parknet.co.jp>
Cc:	"Holden Karau" <holdenk@...dros.com>,
	"Josef Sipek" <jsipek@....cs.sunysb.edu>,
	linux-kernel@...r.kernel.org, "akpm@...l.org" <akpm@...l.org>,
	linux-fsdevel@...r.kernel.org,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Jörn Engel" <joern@...nheim.fh-wedel.de>
Subject: Re: [PATCH 1/1] fat: improve sync performance by grouping writes revised

The performance increase is pretty small. Using an old external dirve
I had lying around I got:
diff -y stock/10k modified/10k
10240+0 records in                                            | 1024+0
records in
10240+0 records out                                           | 1024+0
records out
5242880 bytes transferred in 18.280922 seconds (286795 bytes/ | 524288
bytes transferred in 1.824985 seconds (287283 bytes/se
diff -y stock/1k modified/1k
1024+0 records in                                               1024+0
records in
1024+0 records out                                              1024+0
records out
524288 bytes transferred in 1.777250 seconds (295000 bytes/se | 524288
bytes transferred in 1.764748 seconds (297089 bytes/se

The usual disclaimer of any benchmarking applies, YMMV.

Cheers,

Holden :-)

On 10/31/06, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> wrote:
> Holden Karau <holdenk@...dros.com> writes:
>
> > From: Holden Karau <holden@...scanfly.ca> http://www.holdenkarau.com
> > This is an attempt at improving fat_mirror_bhs in sync mode [namely it
> > writes all of the data for a backup block, and then blocks untill
> > finished]. The old behavior would write & block in smaller chunks, so
> > this should be slightly faster. It also removes the fix me requesting
> > that it be fixed to behave this way :-)
>
> Please post the result of performance test.  If it's fairly big, we
> would be able to use async for mirror FAT. Instead, for hotplug device
> we can provide the another option.
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>


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