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From: "Roy Franz" <roy.lists@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Unable to change sata NCQ depth due to readonly /sys/block/sdc/device/queue_depth file
Date: Thu, 28 Jun 2007 10:19:00 -0700	[thread overview]
Message-ID: <4376bb340706281019m6c39035ey279fe83af9ae9bc1@mail.gmail.com> (raw)

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.

Thanks,
Roy

             reply	other threads:[~2007-06-28 17:19 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-28 17:19 Roy Franz [this message]
     [not found] <fa.5pA6aeQb5Qu4sbwkw3l3yzw2bNQ@ifi.uio.no>
2007-06-28 23:20 ` Robert Hancock

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