Re: MD5 test slowdown

On Thursday 02 July 2009 13:32:08 Rafal Jaworowski wrote:
> I'm observing some heavy slowdown seen with md5 test on PowerPC:
>
> 1. On the MPC8572 machine with today's HEAD I'm getting:
>
> # md5 -t
> MD5 time trial. Digesting 100000 10000-byte blocks ... done
> Digest = 766a2bb5d24bddae466c572bcabca3ee
> Time = 36.930565 seconds
> Speed = 27077842.000000 bytes/second
>
> 2. While a couple of months back it yielded 6x shorter times on this
> very same hardware, like this one:
>
> # md5 -t
> MD5 time trial. Digesting 100000 10000-byte blocks ... done
> Digest = 766a2bb5d24bddae466c572bcabca3ee
> Time = 6.027277 seconds
> Speed = 165912400.000000 bytes/second
>
> Timers work fine, the slowdown is real. I don't know if this is
> PowerPC related, and was wondering if anybody observed something
> similar on other archs perhaps? Any suggestions what could be causing
> this or where to look? I cannot see immediate suspects in the arch/
> platform code.

"signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64" to this mailing list 
reports something that might be related.  It seems there is a patch 
available, but not committed yet.  Though I'm not sure about the nature of 
the problem exactly.  Jeff?

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