lkml.org 
[lkml]   [2003]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Problem with aacraid driver in 2.5.63-bk-latest
From
Date
On Fri, 2003-03-14 at 06:57, Alan Cox wrote:
> On Thu, 2003-03-13 at 23:25, Doug Ledford wrote:
> > Mark Haverkamp wrote:
> > > Then it sounds like the aacraid driver could set cmd_per_lun to a small
> > > number like one since the real queue depth will be set later in
> > > aac_slave_configure.
> >
> > Yes. And since the driver doesn't support anything other than drives to
> > my knowledge, 1 would be appropriate.
>
> It supports both disks and non disk devices. Disks are mapped onto bus 0
> and are driven via firmware smarts as logical devices, non disks are bus 1
> and there it behaves mostly like a scsi controller


Is aac_slave_configure only called for disk devices? If its called for
all scsi devices, then the queue depth will always be set to something a
lot less than 512. I did some searching through the scsi code and I see
only two places that cmd_per_lun is used. It is used to set the queue
depth in scsi_track_queue_full and scsi_alloc_sdev. So it seems that, if
aac_slave_configure gets called for all scsi devices, that setting
cmd_per_lun in the aacraid scsi host template to 1 would be OK. Does
that make sense or did I miss something?

Thanks,
Mark.
--
Mark Haverkamp <markh@osdl.org>

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:33    [W:0.042 / U:0.536 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site