Re: [git patches] libata ACPI support

From: Jeff Garzik
Date: Tue Feb 20 2007 - 18:49:36 EST

Lukas Hejtmanek wrote:
On Tue, Feb 20, 2007 at 05:23:21PM -0500, Jeff Garzik wrote:
introducing SATA ACPI does not work for me (I've filled the bug
report: beside those error
messages, IDE performance is decreased. libata.noacpi=1 option works ok but
the performance is still slightly degraded (about 10%).
Does performance come back if you also use acpi=off ?

It does not.

With 2.6.20-git15, hdparm -t /dev/sda says 28MB/s, with 2.6.20, hdparm -t /dev/sda says 32MB/s.

Can you narrow down the -gitX release further? i.e. does 2.6.20-git13 perform at full speed? -git13 includes several libata changes, but does not include the ACPI additions.

Since this is an ACPI execution error in the bug, that would tend to point to bad BIOS tables. But since there is a performance drop that does not disappear with acpi=off, there might also be another factor, unrelated to ACPI, at play here.


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