Linux-kernel mailing list archive 1998-31,: Re: IDE drive data transfer rates, kernel optimization?

# Re: IDE drive data transfer rates, kernel optimization?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Fri, 7 Aug 1998 14:47:44 +0100 (BST)

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> AFAIK the idea is to enable interrupts while doing IDE transfers to enable
> serial cards etc get their interrupts through. I needed this on one computer
> to use all 5 serial ports without much overruns and underruns. But this
> decreases IDE throughput.

I'd be suprised if you can measure it. The real reason for the IDE unmasking
is that a few very old controllers choked when they didnt get a continual
bitstream for the entire IDE transfer. Basically instead of blocking while
the interrupt service routine caused a delay they seemed to carry on making
up bytes for themselves

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