Date: Wed, 4 Jun 1997 11:07:38 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: gibbs@plutotech.com (Justin T. Gibbs) Cc: luigi@labinfo.iet.unipi.it, toor@dyson.iquest.net, hackers@FreeBSD.ORG Subject: Re: DMA for IDE drives ? Message-ID: <199706040137.LAA09807@genesis.atrad.adelaide.edu.au> In-Reply-To: <199706031502.JAA04331@pluto.plutotech.com> from "Justin T. Gibbs" at "Jun 3, 97 09:58:58 am"
next in thread | previous in thread | raw e-mail | index | archive | help
Justin T. Gibbs stands accused of saying: > Do the newer IDE drives support any concept similar to tagged queueing? > Perhaps via EATA? Supporting DMA is only half the battle in my mind as you > won't get anywhere near the throughput of a SCSI drive if you can't > schedule and have the drive reorder multiple transactions at a time. Not AFAIK; the drive has to remain selected for the entire duration of the transaction. I can't easily see how you could support disconnection and multiple transactions within the scope of the wd interface. > Justin T. Gibbs -- ]] 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 [[
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199706040137.LAA09807>