Originally posted by angdraug
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Running An Encrypted LVM In Ubuntu 10.10
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Originally posted by sreyan View PostI think it will certainly cause a performance hit if the encryption is CPU bound and not IO bound.
As you mentioned yourself, even without AES-NI support in the CPU an i5 should be able to encrypt at ~100 MiB/s, that's much more than 10% of X25-M's read speed, so it doesn't explain an almost tenfold drop in pgbench performance. And I'm sure my dbench tests weren't CPU-bound (my i7 740LM does have AES-NI), and still I see massive performance drop in a write-intensive test on an encrypted volume.
One point I'm ready to concede is that in addition to the corner case I mentioned in my previous post, I see at least two types of modern systems where encrypted LVM performance may be a problem: low-spec netbook/smartbook with a fast SSD, and a cheap NAS with ARM or Atom CPU driving a RAID array of fast SATA disks.
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