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Re: [kitten] Question about AES mode in Kerberos

Luke Howard Bentata <lukeh@padl.com> Wed, 11 January 2023 22:58 UTC

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From: Luke Howard Bentata <lukeh@padl.com>
In-Reply-To: <CAN-5tyG8dya=SuALSA_q=SPy=xVhT_azqp=O+goEKhB+9MHTaQ@mail.gmail.com>
Date: Thu, 12 Jan 2023 09:58:03 +1100
Cc: Greg Hudson <ghudson@mit.edu>, "kitten@ietf.org" <kitten@ietf.org>
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To: Olga Kornievskaia <aglo@umich.edu>
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Subject: Re: [kitten] Question about AES mode in Kerberos
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Hi Olga,

It’s hard to know how this would translate to real-world NFSv4 workloads. I don’t have enough experience with NFS to know, and testing it empirically would involve a chunk of kernel work (even if done on FreeBSD).

Cheers,
Luke

> On 12 Jan 2023, at 3:06 am, Olga Kornievskaia <aglo@umich.edu> wrote:
> 
> Thank you Luke. And I wish you didn't say that you saw 3x performance
> gains....
> 
> On Wed, Jan 11, 2023 at 4:22 AM Luke Howard
> <lukeh=40padl.com@dmarc.ietf.org> wrote:
>> 
>> Thanks Greg, an excellently written mail which I agree with 100%.
>> 
>> I did do some informal performance testing on Heimdal using its test_context tool,* aes256-gcm-128 was over 3x as fast aes256-cts-hmac-sha1-96. Having not done any profiling it’s difficult to say if they’re not other implementation-specific reasons for this being the case.
>> 
>> * modified to run the tests 1024 times with a 64k plaintext size and 2k associated data size
>> _______________________________________________
>> Kitten mailing list
>> Kitten@ietf.org
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