Subject: Re: Port benchmarks
To: Simon Burge <simonb@NetBSD.ORG>
From: Manuel Bouyer <firstname.lastname@example.org>
Date: 04/04/2000 22:16:31
On Wed, Apr 05, 2000 at 06:09:35AM +1000, Simon Burge wrote:
> Do you have OSF that you can install on this machine so as you can
> verify my original DS20 results? It seems that the mmap latency
Unfortunably no, It was a "free OSes" config (not to say a linux config :)
But I think Marc Baudoin (in Cc:) should have one soon, I hope he will
be able to run lmbench on it :)
> figures on NetBSD are slow for some reason, and possibly the filesystem
> benchmarks if the ds20 I had access to had some sort of hardware
> assistance (I got some pretty impressive figures on a 40MHz MIPS R3000
> DEC box running Ultrix that had prestoserve). It would be interesting
> to see a disassembly of the bcopy routine out of libc - I wonder if they
> have a different bcopy for each processor revision or something wierd
> like that...
> I just had a peek at our bcopy - there's appears to be no loop unrolling
> at all (look at the bcopy_samealign_lp). What's the typically loop
> overhead on an alpha CPU?
I don't know, but I would expect that a tuned bcopy would improve things ...
unfortunably I don't know alpha assembly.
Manuel Bouyer, LIP6, Universite Paris VI. Manuel.Bouyer@lip6.fr