Date: Tue, 14 Mar 2006 07:40:37 -0300 From: JoaoBR <joao@matik.com.br> To: kono@kth.se Cc: freebsd-amd64@freebsd.org Subject: Re: amd64 slower than i386 on identical AMD 64 system? / How is hyperthreading handled on amd64? Message-ID: <200603140740.38388.joao@matik.com.br> In-Reply-To: <200603141106.13693.kono@kth.se> References: <20060313221836.5491916A420@hub.freebsd.org> <200603141106.13693.kono@kth.se>
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On Tuesday 14 March 2006 07:06, Alexander Konovalenko wrote: > > Hi > > Since some time (>6.0R) I have the impression that amd64 runs slower th= an > > 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: > so where is your comparism? My point was that the same hardware is faster=20 running i386 I experience this also on X2 machines but do not have two machines to compa= re I have a X2-4400-SMP running amd64 and a X2-4200-SMP running i386 and it gi= ves=20 me the same numbers running ubench Jo=E3o > 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 =20 > 0:17 41.76% 31.98% ubench > > > one ubench executed (with no -s flag =3D 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 > > > A mensagem foi scaneada pelo sistema de e-mail e pode ser considerada segura. Service fornecido pelo Datacenter Matik https://datacenter.matik.com.br
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