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List:       linux-kernel
Subject:    Re: Please Advise: SCSI vs. IDE
From:       Albert Cahalan <albert () ccs ! neu ! edu>
Date:       1996-09-30 23:14:13
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> With ISA busmasters, the kernel has to double-buffer the IO memory for
> the 16MB+ area, which makes the whole idea with DMA fail completely.
> The extra copy is _worse_ than the CPU doing the reading by hand in
> the first place. 

That should not happen if the kernel was compiled with the 16 MB RAM
limit. Until I grepped the kernel source, I thought that config option
would get rid of the double-buffer overhead.

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