Re: IDE from current bk tree, UDMA and two channels...

From: Jens Axboe (axboe@suse.de)
Date: Thu Aug 01 2002 - 05:05:53 EST


On Thu, Aug 01 2002, Marcin Dalecki wrote:
> >hey that sucks :-)
>
> Since IDE 111 not any more...

Yeah I just saw that 110 was the 'broken' solution, 111 made it right.
Good.

> >seriously, the better way to do this would be to change the q->queuedata
> >to be a pointer to drive instead of the channel.
>
> ... becouse this is already *done* there :-).

:-)

> >that would work, but I think it would seriously starve the other device
> >on the same channel.
>
> We starve anyway, becouse the kernel isn't real time and we can't
> guarantee "sleeping" for some maximum time and comming back.
> We don't reschedule the kernel during this kind of "sleeping".
> And we can't know that a command on the "mate" will not take
> extraordinary amounts of time. It's only a problem if mixing travan
> tapes with disks on a channel.

I'm thinking about the alternation of the devices so one device can't
starve the other device off the channel.

-- 
Jens Axboe

- 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/



This archive was generated by hypermail 2b29 : Wed Aug 07 2002 - 22:00:15 EST