Date: Tue, 2 Sep 1997 17:13:39 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: apl@mail.cs.hut.fi (Antti-Pekka Liedes) Cc: freebsd-smp@FreeBSD.ORG Subject: Re: SMP performance on P5 systems? Message-ID: <199709022213.RAA00487@dyson.iquest.net> In-Reply-To: <19970903005101.00664@hutcs.cs.hut.fi> from Antti-Pekka Liedes at "Sep 3, 97 00:51:01 am"
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Antti-Pekka Liedes said: > > The current SMP performance on my Tyan Tomcat IIID dual pentium 200MMX > system is not quite what I had expected, as a simple benchmark, this is > what it takes for me to compile kernel, with UP kernel: > make -j3 283.19s user 32.56s system 94% cpu 5:32.83 total > and with SMP: > make -j3 341.23s user 134.72s system 183% cpu 4:18.80 total > > I was expecting the wall clock time to be less for the SMP kernel, also, > there seems to be quite a lot of system overhead :-/. Of course this > might be because of my relatively slow disks (I use striping on two > Quantum Fireballs, both on different channel of my AHA-3940U). The > benchmarks at www.freebsd.org SMP pages show a lot better performance. Is > it just that ppro beats pentium so much on SMP or what? > I don't know if this is why PPros might sometimes appear to be faster in SMP than P5, but each CPU having a 2nd level cache probably has something to do with it. -- John dyson@freebsd.org jdyson@nc.com
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