gbde performance question

[Heiko Schaefer]

Hi Poul,

> In message <20030520105030.U60060 at 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

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