Core i5 AES acceleration
Doug Rabson
dfr at rabson.org
Tue Mar 9 09:07:55 UTC 2010
On 9 Mar 2010, at 00:10, James R. Van Artsdalen wrote:
> Norikatsu Shigemura wrote:
>> According to http://en.wikipedia.org/wiki/AES-NI , we can get
>> specification document: http://software.intel.com/file/20457 .
>>
>> I saw it, and consider that we can release under BSDL. Because
>> of 'from specification'.
>
> That document is short on details, such as the opcodes and machine
> implementation details (flags, etc).
>
> The XMM registers are used. That may be a problem for kernel code.
>
> When last I looked openssl did not use /dev/crypt - it's not clear how
> big the benefit would be from doing this if nothing that uses openssl wins.
>
> It might be more beneficial to FreeBSD to patch openssl to use
> /dev/crypt. If it turns out to not be a significant win then that might
> hint that the AES opcodes won't be significant win in general either.
The in-kernel kerberos code for NFS would also benefit since it uses the crypto framework.
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