Date: Wed, 04 Mar 1998 18:51:45 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Mike Smith <mike@smith.net.au> Cc: Terry Lambert <tlambert@primenet.com>, hackers@FreeBSD.ORG, Remy NONNENMACHER <remy@synx.com> Subject: Re: Disk write caches Message-ID: <XFMail.980304185145.shimon@simon-shapiro.org> In-Reply-To: <199803050137.RAA23401@dingo.cdrom.com>
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On 05-Mar-98 Mike Smith wrote: >> > Not sure IMHO. Typical wait time before write starts is 20 to 50 ms or >> > half the internal disk buffers. Far less than sync daemon. >> >> Get a caching controller, they start at $250.00 for IDE ones. I measure >> 2us or less for a cache hit to such controller. > > Do you know of any that do DMA? That'd be something *very* much worth > supporting. All The DPT controllers do DMA. The PCI ones do only DMA, no pio anymore. But these are SCSI. The IDE ones look like a standard IDE ``controller''. The ones I saw in the store claimed to do DMA, but my knowledge of IDE is old, outdated. ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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