On my Fedora 9 with AMD64 2GHz single core, the encrytion takes ~15% CPU when I read or write.
Originally Posted by Anato
It is hard to measure the read and write performance, as the error bars are very large.
I made a test with a 50MB file:
using for write
write: (123 + 124 + 201 + 221 + 223) / 5 = 178.4
read: (164 + 293 + 252 + 298 + 293) / 5 = 260
and for read
time dd bs=1MB count=50 if=/dev/zero of=/home/louise/test
Notice how the write performance gets better and better for each try. Very strange!
time cp /home/louise/test /dev/null
Also the numbers are extremely large. I doubt these numbers are correct.
So I guess the conclusion is, that it is very difficult for make a performance test.
The only ones that knows how to do it is the folks at http://www.storagereview.com/