linux-kernel - Re: [git patches] libata ACPI support

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Date:	Wed, 21 Feb 2007 18:56:33 +0100
From:	Lukas Hejtmanek <xhejtman@...l.muni.cz>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: [git patches] libata ACPI support

On Tue, Feb 20, 2007 at 06:49:17PM -0500, Jeff Garzik wrote:
> 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.

I've noticed on lkm another bug report which has pointed me to this:
ata_piix 0000:00:1f.1: version 2.00ac7
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 18
PCI: Setting latency timer of device 0000:00:1f.1 to 64
ata1: PATA max UDMA/100 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001ffa0 irq 14
ata2: PATA max UDMA/100 cmd 0x00010170 ctl 0x00010376 bmdma 0x0001ffa8 irq 15
scsi0 : ata_piix
ata1.00: ATA-6: ST9100824A, 3.04, max UDMA/100
ata1.00: 195371568 sectors, multi 16: LBA48
ata1.01: ATAPI, max UDMA/33
ata1.00: configured for UDMA/33
ata1.01: configured for UDMA/33

Both ports are for some reason configured as UDMA/33.

-- 
Lukáš Hejtmánek
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