Date: Tue, 14 Mar 2006 11:06:12 +0100 From: Alexander Konovalenko <kono@kth.se> To: freebsd-amd64@freebsd.org Subject: Re: amd64 slower than i386 on identical AMD 64 system? / How is hyperthreading handled on amd64? Message-ID: <200603141106.13693.kono@kth.se> In-Reply-To: <20060313221836.5491916A420@hub.freebsd.org> References: <20060313221836.5491916A420@hub.freebsd.org>
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> Hi > Since some time (>6.0R) I have the impression that amd64 runs slower than > i386. Now I run some tests on identical hardware and using ubench confirmes > this. Somebody has comments on this? I have Dual core AMD64 4400+ and FreeBSD RELENG_5. I don't have FreeBSD i386 installed but you can just compare benchmarks. ubench uses all CPU/cores by default, when one ubench is running, top shows: PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND 11528 XXXX 111 0 3572K 880K RUN 1 0:12 93.64% 42.29% ubench 11529 XXXX 111 0 3572K 880K CPU0 1 0:11 97.21% 41.16% ubench 11526 XXXX -8 0 3572K 880K piperd 0 0:17 41.76% 31.98% ubench one ubench executed (with no -s flag = use all CPU, default): Unix Benchmark Utility v.0.3 Copyright (C) July, 1999 PhysTech, Inc. Author: Sergei Viznyuk <sv@phystech.com> http://www.phystech.com/download/ubench.html FreeBSD 5.5-PRERELEASE FreeBSD 5.5-PRERELEASE #12: Sun Mar 5 17:34:07 CET 2006 XXXX@XXXX:/usr/obj/usr/src/sys/DAEMON64SMP amd64 Ubench CPU: 238149 Ubench MEM: 255459 -------------------- Ubench AVG: 246804 two ubench executed with -s flag (use single CPU only): Ubench Single CPU: 120184 (0.40s) Ubench Single MEM: 126787 (0.39s) ----------------------------------- Ubench Single AVG: 123485 Ubench Single CPU: 121000 (0.41s) Ubench Single MEM: 128762 (0.40s) ----------------------------------- Ubench Single AVG: 124881 one ubench executed with -s flag (use single CPU only): Ubench Single CPU: 123251 (0.40s) Ubench Single MEM: 161494 (0.40s) ----------------------------------- Ubench Single AVG: 142372 /Alexander Konovalenko +46-8-5537-8142 (office) +46-7-3752-2116 http://daemon.nanophys.kth.se/~kono Royal Institute of Technology (KTH) Nanostructure Physics Department, Albanova Roslagstullsbacken 21 10691 Stockholm Sweden
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