Date: Tue, 20 May 2003 12:03:19 +0200 (CEST) From: Heiko Schaefer <hschaefer@fto.de> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: current@freebsd.org Subject: Re: gbde performance question Message-ID: <20030520120114.U60060@daneel.foundation.hs> In-Reply-To: <31414.1053424323@critter.freebsd.dk> References: <31414.1053424323@critter.freebsd.dk>
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Hi Poul, > 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. i have already set it to 4k, which i believe matches the settings of my partition. but i still don't see why the processes that are named gbde-something would take up _that_ much cpu time ... does that look reasonable and explicable to you? regards, Heiko -- Free Software. Why put up with inferior code and antisocial corporations? http://www.gnu.org/philosophy/why-free.html
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