Re: IDE-Driver Disk Accounting Missing, Maybe SCSI too......

Mark Lord (mlord@pobox.com)
Mon, 10 Aug 1998 20:08:59 -0400

Theodore Y. Ts'o wrote:
>
> The strategy of using blacklists work as long as the number of bogus
> hardware devices is small, and well-defined. If it's random (i.e.,
> depends on the cable length, or what hardware integrator put together
> the machine, etc.), then sometimes the only thing we can do is disable
> the performance hacks by default, and make the user manually turn on the
> performance enhancements. (And make sure that switches, and warnings,
> are well documented.)

I must agree with this. My experience over the past 6 years or so
is that the few IDE failures seen have all been random in nature.

That's why I just added a config option to not-enable-DMA
rather than attempting to maintain a blacklist.

The flaw in this is that UDMA should always be used regardless,
as it ought to be more reliable than DMA or PIO due to the 16-bit CRC.

But no big deal. Things are working fine as is, I think.

-- 
mlord@pobox.com


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