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Wed, 25 Jun 2008

POHMELFS crypto performance.

I've ran read/reread and write/rewrite tests as described in previous run, now with HMAC(SHA1) of all outgoing transactions (note, that reading response data is not yet encrypted and does not contain digital signature, server also does not support neither operation), essentially only writing should be affected by this, but I also ran reading tests for compelteness.

Results show zero performance overhead of the full data SHA1 hashing, but note that quite fast machines were used (2 3Ghz Xeons (2 physical and 2 logical CPUs, HT enabled) with 1 GB of RAM). All the time only two crypto threads were actively hashing data, since there are only two pdflush threads on this machine.





Writing is even faster with hashing, but results drifted around, so essentially performance is the same.

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