Re: ATA TCQ problems in 2.5.59

[Jens Axboe <axboe@suse.de>]

On Sun, Jan 26 2003, Mark Hahn wrote:
> > I'm trying to turn on TCQ on 2.5.59, but it doesn't seem be able to set it to 
> > anything but 0 and 1. This is with TCQ default 'off':
> > 
> > # cat /proc/ide/hda/settings | grep using_tcq
> > using_tcq               0               0               32              rw
> > # echo using_tcq:32 > /proc/ide/hda/settings
> > # cat /proc/ide/hda/settings | grep using_tcq
> > using_tcq               1               0               32              rw
> 
> but it's a flag, not a count.  use CONFIG_BLK_DEV_IDE_TCQ_DEPTH
> if you want something other than the default depth of 1.

It's a flag, correct. The default depth is 32 though, not 1. And with
newer hdparms you can use -Q to set/query the tag depth of the drive. Be
careful with that though, it's not too well tested. IDE TCQ in 2.5 needs
a bit of work, I hope to do so soonish...

-- 
Jens Axboe