From: Zdenek Kaspar <zkaspar82@gmail.com>
To: linux-crypto@vger.kernel.org
Subject: serpent-sse2 - different key size same speed?
Date: Mon, 19 Mar 2012 19:06:47 +0100 [thread overview]
Message-ID: <jk7sn8$blt$1@dough.gmane.org> (raw)
Hello everyone,
I just quick tested 3.3.0 kernel (x86_64) to get idea how serpent-sse2
implementation works on Core2 machine. My dirty testing revealed that
key size doesn't have impact on speed. Is such behavior normal ?
Test machine: Core2 E6600 (2.40GHz), 3GB RAM, Scientific Linux 6.2
dm-crypt on /dev/loop0, 1.5G image file:
/dev/loop0: [0010]:11323 (/dev/shm/test.img)
Encrypt (dd if=/dev/zero of=/dev/mapper/test bs=1M)
-s 256 -c aes-xts-plain64 : 159 - 162 MB/s
-s 512 -c aes-xts-plain64 : 129 - 141 MB/s
-s 256 -c serpent-xts-plain64 : 142 - 146 MB/s
-s 512 -c serpent-xts-plain64 : 139 - 148 MB/s
Decrypt (dd if=/dev/mapper/test of=/dev/null bs=1M)
-s 256 -c aes-xts-plain64 : 113 - 114 MB/s
-s 512 -c aes-xts-plain64 : 90.1 MB/s
-s 256 -c serpent-xts-plain64 : 105.0 MB/s
-s 512 -c serpent-xts-plain64 : 105.0 MB/s
(perf top shows as expected high usage of: serpent_dec_blk_8way and
serpent_enc_blk_8way)
Z.
next reply other threads:[~2012-03-19 18:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-19 18:06 Zdenek Kaspar [this message]
2012-03-20 6:53 ` serpent-sse2 - different key size same speed? Jussi Kivilinna
2012-03-20 8:08 ` Zdenek Kaspar
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