Tejun Heo wrote:
On Sat, Mar 04, 2006 at 12:35:05PM -0500, Jeff Garzik wrote:
This patch has been sitting in my tmp directory for ages.
We should probably turn this on, though the practical difference is
probably minimal.
The patch works okay on my machine (ICH7R) although the patch didn't
apply to #upstream. I'm not very sure about this change though.
1. Why apply it only to ATAPI devices? ATA devices can benefit to.
If it's because this bit shouldn't be turned on for NCQ, we can
turn it on conditionally. We'll probably need similar condition
for ATAPI devices too if we support FIS-based PM switching.
Main reason is that it will largely only have benefits on ATAPI devices,
and I've only tested it on ATAPI devices.
2. I'm a bit skeptical whether this change will bring any noticeable
performance improvement. OTOH, this seems to be a good source for
Agreed.
obscure problems on some controllers which might not implement/test
this feature properly. As more controllers implement AHCI spec,
the possibility grows.
Agreed.
Anyways, here's the patch regenerated against #upstream.
Could I trouble you for a resend, with a proper signed-off-by and patch
description?
Jeff
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