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Date: Mon, 25 Jul 2011 11:40:41 -0500
From: James Nobis <quel@...lrod.net>
To: john-users@...ts.openwall.com
Subject: Re: 1.7.8 to jumbo2 speed regression for FreeBSD md5
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>> john-1.7.8
>> Benchmarking: FreeBSD MD5 [32/64 X2]... DONE
>> Raw: 14537 c/s real, 14566 c/s virtual
>>
>> john-1.7.8-jumbo2
>> Benchmarking: FreeBSD MD5 [8x]... DONE
>> Raw: 6656 c/s real, 6656 c/s virtual
>
> I've revised the gcc version check in 1.7.8-jumbo-4 to only use the new
> code with gcc 4.4+, assuming that your version of gcc is somewhere
> between 4.0 and 4.3.x. Did this help?
It's Debian Lenny (needs an upgrade to Squeeze) so yes it is 4.3.2.
Benchmarking: FreeBSD MD5 [32/64 X2]... DONE
Raw: 14302 c/s real, 14446 c/s virtual
looks good
> Ideally, we'd test all of: 4.0, 4.1, 4.2, 4.3, 4.4 to determine which is
> the lowest gcc version number where the new code is beneficial... We
> could have to do this on different CPUs, though. Recent Intel CPUs tend
> to perform better at SSE2 than AMD's do, so the same version of gcc may
> be good enough for Intel, but not good enough for AMD.
>
> With gcc 4.5.0, the SSE2 intrinsics code definitely performs faster for
> me, but that's on Intel CPUs only (no AMDs here).
gcc 4.5.x on Intel and AMD tends to generate faster code for me across a range of things.
(Bootstrapped 4.5.3 on Debian Squeeze...think I had 1 lib I had to pull into the gcc tree to have it
build all the optimization features.)
James
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