Date: Tue, 20 May 2003 11:52:03 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Heiko Schaefer <hschaefer@fto.de> Cc: current@freebsd.org Subject: Re: gbde performance question Message-ID: <31414.1053424323@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 20 May 2003 11:08:07 %2B0200." <20030520105030.U60060@daneel.foundation.hs>
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In message <20030520105030.U60060@daneel.foundation.hs>, Heiko Schaefer writes: >i figure this is the amount of cpu time that is used by raw number >crunching (and for example does not include disk-io or anything of that >sort). that would mean that ~1/3 of my cpu can do ~8 MB/s of gbde's >crypto. if so, i could estimate that gbde can theoretically process >roughly 25MB/s on this athlon 1800+. > >that looks like an rather low number to me. sites such as > >http://www.tcs.hut.fi/~helger/aes/rijndael.html > >suggest that on a cpu of that speed, memory bandwidth should be the >limiting factor when using AES/Rijndael. > >am i overlooking something ?! Make sure you use as large as possible a sectorisize on your GBDE devices, you set this with "gbde init /dev/bla -i", this does affect your performance a fair bit. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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