From: Jeff Garzik <jeff@garzik.org>
To: Indan Zupancic <indan@nul.nu>
Cc: linux-ide@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] sata_sil: Greatly improve DMA support
Date: Sat, 19 May 2007 18:03:44 -0400 [thread overview]
Message-ID: <464F7440.10900@garzik.org> (raw)
In-Reply-To: <1441.81.207.0.53.1179591630.squirrel@secure.samage.net>
Indan Zupancic wrote:
> This patch seems to work with my SiI 3512, though I don't notice any
> difference, neither a speedup, nor a slowdown. Hdparm gives the same
> speeds (-tT), and cp -a'ing kernel sources is abysmal slow in both cases,
> (need to look into that one) so I didn't really test it that well.
It won't result in much of a speedup, except in situations where IOMMU
or other situation that causes you to run into the 64k boundary being an
issue -- generally only on huge transfers.
A good measure is to dd(1) to/from the block device, rather than using a
filesystem. As has been shown on LKML, the filesystem can really slow
things down in some cases.
Jeff
next prev parent reply other threads:[~2007-05-19 22:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-19 5:35 [PATCH] sata_sil: Greatly improve DMA support Jeff Garzik
2007-05-19 16:20 ` Indan Zupancic
2007-05-19 22:03 ` Jeff Garzik [this message]
2007-05-19 23:22 ` Indan Zupancic
2007-05-20 10:19 ` Tejun Heo
2007-05-20 13:38 ` Indan Zupancic
[not found] <fa.SqfRJHzGgf3m6sdJPwJTwHDPSuw@ifi.uio.no>
2007-05-19 17:01 ` Robert Hancock
2007-05-19 21:27 ` Jeff Garzik
2007-05-19 21:31 ` Jeff Garzik
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