Date: Fri, 26 Oct 2001 19:49:26 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: Greg Lehey <grog@FreeBSD.org> Cc: Doug Rabson <dfr@nlsystems.com>, Luigi Rizzo <rizzo@aciri.org>, John Baldwin <jhb@FreeBSD.org>, Jonathan Lemon <jlemon@FreeBSD.org>, cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: Re: RAID-5 parity calculations (was: cvs commit: src/sys/dev/fxp if_fx) Message-ID: <Pine.BSF.4.21.0110261948360.12956-100000@beppo> In-Reply-To: <Pine.BSF.4.21.0110261943390.12956-100000@beppo>
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> > Instantaneously? Well, how long does it take to checksum 6 kB (the > > average request size)? That's 1500 words, say 10000 instructions. At > > 1 GHz, that's 10 µs, which is completely negligible compared to the > > minimum four I/O transactions needed, which add up to about 25 ms. > > BTW- for the Convex in question, the average request size was 64K. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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