On Wed, 2006-08-30 at 12:04 -0700, Luben Tuikov wrote:
> > --- a/drivers/scsi/aic94xx/aic94xx_init.c
> > +++ b/drivers/scsi/aic94xx/aic94xx_init.c
> > @@ -71,7 +72,7 @@ static struct scsi_host_template aic94xx
> > .change_queue_type = sas_change_queue_type,
> > .bios_param = sas_bios_param,
> > .can_queue = 1,
> > - .cmd_per_lun = 1,
> > + .cmd_per_lun = 2,
>
> Why 2? Why not 3? If you can set this to 3, then why not 4?
> But if you can set it to 4, why not 5?
>
> This value should also be dynamically set, it should depend on
> the type of LU and it shouldn't be present in the host template.
> (But that's an architectural argument which leads nowhere on lsml.)
actually, cmd_per_lun is pretty much a vestigial variable. It's used
for the initial queue depth before the driver decides to turn on TCQ.
Thus, since the non-tagged depth should always only be 1, the only
useful value to set it to is 1.
James
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