Messages in this thread | | | Date | Mon, 24 Jul 2000 00:54:53 +0200 | From | Pavel Machek <> | Subject | Re: VIA IDE driver, v1.5 (final) |
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Hi!
> > > 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.
That seems wrong. If you have server capable of UDMA/66 and you run it for year or so, you are likely to find it in PIO mode. Not good.
Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
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