Re: [PATCH] deadline io scheduler

Patrick Mansfield
2002-09-26T15:49:43Z

On Thu, Sep 26, 2002 at 08:59:51AM +0200, Jens Axboe wrote:
> On Thu, Sep 26 2002, Jens Axboe wrote:
> BTW, for SCSI, it would be nice to first convert more drivers to use the
> block level queued tagging. That would provide us with a much better
> means to control starvation properly on SCSI as well.
>
> --
> Jens Axboe

I haven't look closely at the block tagging, but for the FCP protocol,
there are no tags, just the type of queueing to use (task attributes)
- like ordered, head of queue, untagged, and some others. The tagging
is normally done on the adapter itself (FCP2 protocol AFAIK). Does this
mean block level queued tagging can't help FCP?

Maybe the same for iSCSI, other protocols, and pseudo adapters -
usb, ide, and raid adapters.

-- Patrick Mansfield