Date: Tue, 25 Feb 1997 18:58:59 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: bde@zeta.org.au (Bruce Evans) Cc: ken@stox.pr.mcs.net, msmith@atrad.adelaide.edu.au, freebsd-hardware@freebsd.org Subject: Re: Memory speed of P6-200 (256k) Message-ID: <199702250829.SAA14217@genesis.atrad.adelaide.edu.au> In-Reply-To: <199702250819.TAA02011@godzilla.zeta.org.au> from Bruce Evans at "Feb 25, 97 07:19:41 pm"
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Bruce Evans stands accused of saying: > >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. ie. the fast copyin/out code will make busmaster devices faster too? 8) > Bruce -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[
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