Date: Tue, 25 Feb 1997 19:19:41 +1100 From: Bruce Evans <bde@zeta.org.au> To: ken@stox.pr.mcs.net, msmith@atrad.adelaide.edu.au Cc: freebsd-hardware@freebsd.org Subject: Re: Memory speed of P6-200 (256k) Message-ID: <199702250819.TAA02011@godzilla.zeta.org.au>
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>As Bruce has observed, this makes for very healthy IDE performance, >which is what this whole thread started with. Er, no, fast copying reduces buffer cache overheads. Buffer cache overheads are almost large enough to significantly reduce the advantages of busmastering DMA over (slow) PIO. Bruce
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