Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sun, 21 Dec 2003 13:48:40 -0500 | From | Ben Collins <> | Subject | Re: Firewire/sbp2 troubles with Linux 2.6.0 |
| |
> > I'm guessing that your card doesn't like getting some many commands at > > once. It's possible that your sbp2 device itself cannot handle it > > (generally, I've found it to be caused by the card though). > > Is it possible to set the limit somewhere between the default and > complete serialization? Shouldn't it be possible to detect such > things automatically, somehow?
Things are attempted to be detected, but somehow that only works 95% of the time. I'd blame bad sbp2 devices, but I don't have anything to back that up. You can look in sbp2.c to see where it sets the max commands.
> > As far as 10mbs, you have to remember that even though firewire is much > > higher than that, your drive is still an IDE, and the firewire is still > > going through an IDE bridge. So the limitation lies in the IDE bridge. > > I've seen performance as high as 34MB/s with good IDE bridges and > > drives, though. > > The disks will easily do 40 MB/s on a good IDE controller. It seems > like a rather bad bridge to me if it has that much overhead. I > haven't seen many different options for sale, either.
Most things based on newer Oxford chips seem to work pretty well. What ohci1394 controller do you have though?
-- Debian - http://www.debian.org/ Linux 1394 - http://www.linux1394.org/ Subversion - http://subversion.tigris.org/ WatchGuard - http://www.watchguard.com/ - 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/
| ![\](/images/icornerr.gif) |