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Date: Thu, 28 Jun 2007 17:20:18 -0600 From: Robert Hancock <hancockr@...w.ca> To: Roy Franz <roy.lists@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Unable to change sata NCQ depth due to readonly /sys/block/sdc/device/queue_depth file Roy Franz wrote: > Hi, > > I am unable to change the NCQ settings for a sata drive that > supports it - NCQ is always on. This is due to the sysfs queue_depth > file being read-only. This is on > vanilla 2.6.21.5 running with Debian Etch. (Several earlier versions > of the kernel > had this same issue.) The drive (WD Raptor) is hooked up to a Nvidia > sata controller. > > amd64:/# ls -al /sys/block/sdc/device/queue_depth > -r--r--r-- 1 root root 4096 2007-06-28 10:04 > /sys/block/sdc/device/queue_depth > amd64:/# cat /sys/block/sdc/device/queue_depth > 31 > amd64:/# > > I searched but did not find any helpful information on this. Forcing > a change by changing permissions on the file did not work. Looks like sata_nv is missing the change_queue_depth function in the SCSI host template, resulting in this file showing as read-only. I'll cook up a patch when I get a chance. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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