Re: [Fed-Talk] Lion FileVault
Re: [Fed-Talk] Lion FileVault
- Subject: Re: [Fed-Talk] Lion FileVault
- From: Taylor Armstrong <email@hidden>
- Date: Fri, 22 Jul 2011 15:22:54 -0400
Just to follow up on my own question from earlier.
I can confirm a roughly 12% impact on throughput on my personal MBP
writing to a FileVault2 volume (roughly 190mb/sec vs 215mb/sec writing a
test file to a SSD)
Slight, but tolerable CPU hit.. kernal_task hovered around 4.0% while
writing to a *non*-encrypted volume, and about 35% when writing to an
encrypted volume. So yes, I can see the difference when watching
Activity Monitor, but it certainly isn't enough to cause major stress on
the CPU and have fans spooling up. So roughly a 30% increase in CPU
activity for one cpu core (out of the 4 available on my machine)....
Reads did NOT seem to be impacted as much in terms of throughput -
averaged about 315mb/sec reads on both volumes, although again -
kernel_task was basically a non-issue when reading from the "regular"
volume, and bounced between 30-40% when reading from the encrypted volume.
(note - both volumes are on the same physical disk, just my "regular"
and my "test" partitions on a 256gb SSD. Tests were done writing out
10-20gb files using DD, not the most scientific, but easily repeatable
for testing purposes.)
Taylor
On 7/21/2011 4:15 PM, Taylor Armstrong wrote:
An interesting test would be to see what sort of CPU hit you encounter
as well.... with SSD's, a 12% throughput hit isn't all that horrible,
but I'm curious what impact it has on CPU doing the
encryption/decryption on the fly. Will writing files cause my MBP to
spin the fans up? Writing an encrypted DMG sure does....
Taylor
On 7/21/2011 4:10 PM, David Emery wrote:
I installed FileVault on an older MB Pro (that happens to have a
Momentus XT Hybrid drive in it), ran XBench Disk Test, then enabled
File Vault encryption and re-ran the Disk Test benchmark. FileVault
inflicted a roughly 12% performance hit. This is not a scientific
test for many reasons, but it's probably a good first blush.
Does Lion support FileVault encryption on external drives, too? How
about Lion Server? (Now that it's out, I guess we can talk about
such things, right?)
dave
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David Emery, 703 298 3473 (c) 703 272 7496 (fax)
Supporting PdM Software Integration
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