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Message-ID: <20111218151945.GA373@openwall.com>
Date: Sun, 18 Dec 2011 19:19:45 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: 1.7.9-jumbo
On Sun, Dec 18, 2011 at 06:48:33PM +0400, Solar Designer wrote:
> Minimum: 0.81602 real, 0.81602 virtual
...
> Also, someone could want to identify the format that became 18% slower
> and see if this is reproducible and if it can be avoided (in a future
> version).
It's CRC-32. On 1.7.8-jumbo-8 we had:
Benchmarking: CRC-32 [32/64]... DONE
Many salts: 63225K c/s real, 63225K c/s virtual
Only one salt: 28983K c/s real, 28696K c/s virtual
1.7.9-jumbo-5 gives only:
Benchmarking: CRC-32 [32/64]... DONE
Many salts: 51593K c/s real, 51593K c/s virtual
Only one salt: 27557K c/s real, 27557K c/s virtual
(same machine, same compiler, same make target, no load).
With CRC-32 excluded, the minimum improves to:
Minimum: 0.87716 real, 0.87718 virtual
and now it's NTLM, which is worrisome. Old:
Benchmarking: NT MD4 [128/128 X2 SSE2-16]... DONE
Raw: 26734K c/s real, 26469K c/s virtual
New:
Benchmarking: NT MD4 [128/128 X2 SSE2-16]... DONE
Raw: 23450K c/s real, 23218K c/s virtual
Looks bad to me. Unlike CRC-32, NTLM's performance actually matters.
And yes, this is reproduced on my second pair of benchmark runs as well.
With NTLM excluded as well, the new minimum is:
Minimum: 0.94607 real, 0.94937 virtual
And it is for "dynamic_10: md5($s.md5($s.$p)) :Many salts", which I
don't care much about. And it's only 5%.
Can someone look into the NTLM performance regression? And maybe into
others as well, but NTLM is the important one.
We gained NT2, which is slightly faster:
Benchmarking: NT v2 [SSE2i 12x]... DONE
Raw: 25731K c/s real, 25731K c/s virtual
but still slower than what NT used to achieve in 1.7.8-jumbo-8. And I
am not familiar with other possible differences between these two (e.g.,
are they the same or different in handling of non-ASCII)?
Alexander
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