On Thu, Nov 02 2006, Mike Miller (OS Dev) wrote:
> On Thu, Nov 02, 2006 at 03:11:50PM +0100, Jens Axboe wrote:
> > On Wed, Nov 01 2006, Mike Miller (OS Dev) wrote:
> > > + {0x3211103C, "Smart Array E200i", &SA5_access, 120},
> >
> > Is it 120, or 128? And how big is the allocated command array now, with
> > 512 commands?
>
> The controller can handle up to 128, but I artificially limited it to 120
> for reasons I shouldn't discuss in public. :)
:-)
> Each command is 548 bytes w/o scatter gather chaining. So 548 * 512 = 280576
> bytes for the command list. We've tested using 1024 commands with several
> Smart Array controllers and have not encountered issues. The reason for the
> increase is performance. The busier you can keep the controller the better
> it works.
So this:
hba[i]->cmd_pool = (CommandList_struct *)
pci_alloc_consistent(hba[i]->pdev,
NR_CMDS * sizeof(CommandList_struct),
&(hba[i]->cmd_pool_dhandle));
is getting pretty huge then (it was already, actually).
--
Jens Axboe
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