linux-kernel - Re: comparison of the AF_ALG interface with the /dev/crypto

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Date:	Thu, 1 Sep 2011 12:15:34 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Nikos Mavrogiannopoulos <nmav@...tls.org>
Cc:	cryptodev-linux-devel@....org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: comparison of the AF_ALG interface with the /dev/crypto

Nikos Mavrogiannopoulos <nmav@...tls.org> wrote:
>
> Given my benchmarks have no issues, it is not apparent to me why one
> should use AF_ALG instead of cryptodev. I do not know though why AF_ALG
> performs so poor. I'd speculate by blaming it on the usage of the socket
> API and the number of system calls required.

The target usage of AF_ALG is hardware offload devices that cannot
be directly used in user-space, not software crypto on implementations
such as AESNI/Padlock.

Going through the kernel to use something like AESNI/Padlock or
software crypto is insane.

Given the intended target case, your numbers are pretty much
meaningless as cryptodev's performance can be easily beaten
by a pure user-space implementation.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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