[60128] in cryptography@c2.net mail archive
Re: Can you keep a secret? This encrypted drive can...
daemon@ATHENA.MIT.EDU (Ralf Senderek)
Mon Nov 6 10:25:22 2006
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Sat, 4 Nov 2006 10:35:15 +0000 (GMT)
From: Ralf Senderek <ralf@senderek.com>
To: Alexander Klimov <alserkli@inbox.ru>
Cc: cryptography@metzdowd.com
On Thu, 2 Nov 2006, Alexander Klimov wrote:
> I guess many people here have tried full disk encryption for
> themselves, do you notice any difference in performance or not?
Yes and no!
I use dm-crypt on a Linux laptop with FC5.
On the encrypted filesystem:
# > df
/dev/mapper/secure 309895 213342 80553 73% /secure
# > time dd if=/dev/zero of=cryptogram bs=1MB count=50
50+0 records in
50+0 records out
50000000 bytes (50 MB) copied, 1.96366 seconds, 25.5 MB/s
dd if=/dev/zero of=cryptogram bs=1MB count=50 0.00s user 0.52s system 25%
cpu 2.023 total
On the unencrypted filesystem:
# > time dd if=/dev/zero of=cryptogram bs=1MB count=50
50+0 records in
50+0 records out
50000000 bytes (50 MB) copied, 0.216106 seconds, 231 MB/s
real 0m0.257s
user 0m0.000s
sys 0m0.252s
The factor 9.05 making the the unencrypted filesystem faster than the
encrypted one really does not make a difference for me for anything I do.
I'd be happy with 1 MB/s and I got 25! (using AES-256)
Regards
Ralf Senderek
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