From: Joakim Reinert <mail@jreinert.com>
To: dm-crypt@saout.de
Subject: [dm-crypt] Performance problems
Date: Mon, 19 Nov 2012 12:51:15 +0100 [thread overview]
Message-ID: <50AA1D33.7030109@jreinert.com> (raw)
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Hello,
i intended to use dm-crypt + LUKS to encrypt my entire file system. I
ran into the following problem: After finishing cryptsetup i noticed
by testing with dd (dd if=/dev/zero of=/dev/mapper/cryptroot) with
different blocksizes, that i had read and write speeds of roughly
50MB/s. If you consider my setup, you will agree, that this is way too
slow:
cpu: i7-2620 (AES-NI integrated)
disk: Crucial m4 226GB SSD
ram: 4GB DDR-3 1333Mhz (Single Channel)
Additional information:
kernel: linux 3.6.6.1
os: arch linux
I have loaded the module aesni_intel and verified that the refcnt
changes in /proc/crypto when i open/close the encrypted partition.
I've already harrassed everybody at #archlinux and #crypto in IRC but
nobody seems to know what the problem might be. I also installed
truecrypt and did some benchmarks which show encryption and decryption
speeds of roughly 2GB/s.
Might this have something to do with the data alignment on disk? At
least with lvm it's suggested to define dataalignment=1m on SSD's. Is
it possible to define data alignment for dm-crypt?
Another possibility that would come to mind is a bug in the kernel.
I followed this guide to set up the encryption by the way:
https://wiki.archlinux.org/index.php/Dm-crypt_with_LUKS
Hoping to hear from you soon.
Kind regards
Joakim Reinert
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next reply other threads:[~2012-11-19 11:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-19 11:51 Joakim Reinert [this message]
2012-11-19 20:02 ` [dm-crypt] Performance problems Milan Broz
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