Re: [PATCH] blacklist NCQ on Seagate Barracuda ST380817AS

From: Paolo Ornati
Date: Sun Sep 30 2007 - 10:46:26 EST

On Sun, 30 Sep 2007 15:29:08 +0100
Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:

> > Seagate Barracuda ST380817AS has troubles with NCQ. For example,
> > unpacking a tarball on an XFS filesystem gives this:
> >
> > ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x2 frozen
> > ata1.00: cmd 61/40:00:29:a3:98/00:00:00:00:00/40 tag 0 cdb 0x0 data 32768 out
> > res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> What makes you sure that is an NCQ problem ?

It goes away with:
echo 1 > /sys/block/sda/device/queue_depth

I have this problem only with XFS, and even with XFS it goes away
mounting with "nobarrier"...

Paolo Ornati
Linux 2.6.23-rc8-ga64314e6-dirty on x86_64
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