NVIDIA MCP55 NCQ

NVIDIA MCP55 NCQ

[Richard Scobie]

Am running a Redhat FC6 machine with kernel 2.6.19-1.2911.6.5 and 
wondering if there is not yet support for the NCQ feature of sata_nv on 
boards using the NVIDIA MCP55 chipset.

ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata4.00: ATA-7, max UDMA/133, 976773168 sectors: LBA48 NCQ (depth 0/32)
ata4.00: ata4: dev 0 multi count 1
ata4.00: configured for UDMA/133
scsi 2:0:0:0: Direct-Access     ATA      WDC WD5000YS-01M 09.0 PQ: 0 ANSI: 5
SCSI device sdc: 976773168 512-byte hdwr sectors (500108 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
SCSI device sdc: 976773168 512-byte hdwr sectors (500108 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00

The drive is NCQ capable and when I attempt to:

echo 31 > /sys/block/sdc/device/queue_depth

I get a "permission denied", (as root) and am reluctant to force the 
issue, as I understand it should all just work, (depth 31/3), if 
everything is OK.

Regards,

Richard

Re: NVIDIA MCP55 NCQ

[Dâniel Fraga]

On Thu, 08 Mar 2007 10:56:30 +1300
Richard Scobie <richard@sauce.co.nz> wrote:

> Am running a Redhat FC6 machine with kernel 2.6.19-1.2911.6.5 and 
> wondering if there is not yet support for the NCQ feature of sata_nv
> on boards using the NVIDIA MCP55 chipset.

> I get a "permission denied", (as root) and am reluctant to force the 
> issue, as I understand it should all just work, (depth 31/3), if 
> everything is OK.

	The only chipsets supported by sata_nv driver are nForce4
(CK804/MCP04) SATA controllers:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fbbb262d9ea9bdbd79d7058271560e9990bc62d3

	MCP55 isn't supported. On newer chipsets (MCP65, MCP67...)
nvidia moved to AHCI.

	I think that if nobody with the necessary knowledge to support
those chipsets like MCP55 decides to program, we'll be on our
own :( unfortunately.

	I searched nvnews.net forum and it seems nvidia will do nothing
about it... :(

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