Messages in this thread | | | Date | Sun, 23 Jul 2000 18:56:00 +0200 | From | Vojtech Pavlik <> | Subject | Re: VIA IDE driver, v1.5 (final) |
| |
On Sun, Jul 23, 2000 at 08:35:16PM +0400, Khimenko Victor wrote:
> > Fortunately all UDMA transfers are protected by safe enough CRC to see > > if a transfer fails. This way you can know your cable won't do UDMA/66 > > and switch to something slower. (UDMA/44 seems to work on most 40-wire > > cables just fine). If that doesn't work, go even lower. Something like > > modem autobauding ... > > If it'll work like modem autobauding here (connect with speed limit=14400 > and get 1.5Kbytes/second, connect with 33600 and spend 95% of time for > retrains and thus transfer with 0.1Kbytes/second speed in the end) then > better not... > > P.S. Sorry, could not resist...
:)))))))) It'd be like this if you let UDMA/66 enabled on a 40-wire cable. What I meant is that after a *single* CRC error the speed would be lowered to the next lower step (UDMA 100, 66, 44, 33, 16) and if even UDMA/16 doesn't work, then fall back to PIO.
PS. You have damn bad modems if they behave like that. Mine just lower the rate until the rate of retrains is acceptable. But yes, I have to admit that Morotola 3265's tend to be expensive, yes.
-- Vojtech Pavlik SuSE Labs
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |