hi,
i've also posted this to dm-crypt mailing list, but here is some
additional info.
i've encrypted my hard disks (whole root, and other disks)
with "cryptsetup luksFormat --cipher aes-cbc-essiv:sha256 --key-size
256" and formatted them with ext3 (-j -m0 -O dir_index).
i'm using 2.6.15.1 kernel on an athlon xp 2400+ with 1GB RAM, VIA
KT400A/VT8237 chipset.
/proc/crypto for aes:
name : aes
module : kernel
type : cipher
blocksize : 16
min keysize : 16
max keysize : 32
i searched for the aes-i586 optimization (that should be in the
kernel?) but i found no other reference to it than
CONFIG_CRYPTO_AES_586=y. guess i'm using the asm optimized code as
there is no other AES option in the kernel.
if i copy files from one encrypted disk to another my cpu usage goes up
to 100% and stays there for the whole copy process. renicing cp itself
doesn't help.
hdparm settings are the same for all disks except the SATA ones.
multcount = 16 (on)
IO_support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
kjournald and pdflush use all the cpu time, where kjournald is usually
at about 40-70% and pdflush goes up to 50-60%. this is while copying
large files. the cpu usage of kcryptd is negligible.
if i copy many small files, kcryptd will eat much more cpu, about
30-40% and the rest will be pdflush and kjournald.
all disks are mounted with -o defaults,noatime.
doing a 'mke2fs -j -m0 -O dir_index /dev/mapper/name' will also rise the
cpu usage to its maximum where pdflush takes about 60-70%.
(mke2fs 1.38 (30-Jun-2005) Using EXT2FS Library version 1.38)
is anyone else seeing this and is there a solution (besides using a
non-journalling fs) or do i have to live with it that encryption eats
all my cpu?
tx,
JG
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