Date: Wed, 05 Apr 2000 16:57:09 -0400 From: Doug Ledford <dledford@redhat.com> To: sjbuller@us.ibm.com Cc: aic7xxx@FreeBSD.ORG Subject: Re: aic7xxx=tag_info Message-ID: <38EBA8A5.80B1AFD8@redhat.com> References: <872568B3.006E7E87.00@d53mta04h.boulder.ibm.com>
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sjbuller@us.ibm.com wrote:
>
> I need to surgically set the TCQ depths for one of my devices
> without clobbering TCQs for the whole system. The
> aic7xxx=tag_info parm looks like just the ticket, but can't
> get it to do what I told it to do.
>
> I've compiled the driver into the kernel, removed it from
> conf.modules and added the following to lilo.conf:
>
> append="max_scsi_luns=64 aic7xxx=tag_info:{,,{0,1,2,3,4,5,6,7}}"
>
> This should leave the first two adapters (0 and 1) alone and
> set scsi2 ID0 to 0, ID1 to 1, etc. for demo purposes.
>
> This works for ID0-3, but does not for ID4-7. I get:
>
> Default Tag Queue Depth: 100
> Tagged Queue By Device array for aic7xxx host instance 2:
> {0,1,2,3,0,0,0,0,0,0,0,0,0,0,0,0}
> Actual queue depth per device for aic7xxx host instance 2:
> {1,1,1,1,1,1,100,1,1,1,1,1,1,1,1,1}
>
> Since I could not get past ID3, I had to use a sledgehammer
> solution of compiling the kernel with TCQ with TCQ
> default=enabled and default depth=100 (I need to set TCQ depth
> on ID6 to around 75 or 80).
>
> I would like to leave everything as close to "out of box" as
> possible by just enabling and setting scsi2:ID6 to whatever.
>
> Another attempt with:
> append="max_scsi_luns=64 aic7xxx=tag_info:{,,{75,75,75,75,75,75,75,75}}"
> Resulted in:
> Tagged Queue By Device array for aic7xxx host instance 2:
> {75,75,75,0,0,0,0,0,0,0,0,0,0,0,0,0}
> Note that only the first 3 were set....
>
> Any ideas what is going on here?
Sounds like lilo is eating your append line in some way. I've got a much
longer append line that works fine with my setup. You can always skip the
first few devices in host instance 2 to get on up to where you want to be:
tag_info:{,,{,,,,75}} would actually be fine if all you wanted was to set the
depth on device 4 of controller 2 to 75.
--
Doug Ledford <dledford@redhat.com> http://people.redhat.com/dledford
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