Date: Mon, 09 May 2005 17:10:48 +0100 From: Pete French <petefrench@ticketswitch.com> To: ewan@mathcode.net, freebsd-stable@freebsd.org Subject: Re: Performance issue Message-ID: <E1DVAqG-000Bzf-PA@dilbert.firstcallgroup.co.uk> In-Reply-To: <20050509150018.GF281@mathcode.net>
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> Whereas, the typical result for the new rig looked more like
>
> 105.36 real 71.10 user 33.41 sys
...
> 10548 involuntary context switches
Now I just ran this test myself. This machine is a 2.4 gig P4 with
hyperthreading enabled. Much as I am an AMD fan, I would expect a 1gig
Athlon to be significantly slower than a 2.4 gig Pentium 4.
but:
93.45 real 56.55 user 36.85 sys
1857 involuntary context switches
Uhhh... so it takes almost the same time to do the calculation, but spends
actually *more* of it in system space. Does far less context switches though,
but I am assuming thats due to HTT.
Numbers look very odd to me. So I then ran it on another P4 system we have
round here which is still running 4.11. This is a 2.66 gig P4, not a 2.4
so it should be a bit faster, but:
33.77 real 33.49 user 0.07 sys
711 involuntary context switches
Over two and a half times faster ?! Thats not right at all!
All the new systems I have tried are 5.4-RC4, so should be the
latest and greatest. When my colleague finishes on his machine I
can try a GENERIC 5.4-RC4 kernel on another P4 and see what that
gives.
-pcf.
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