Date: Thu, 06 Jan 2005 14:44:48 -0800 From: Julian Elischer <julian@elischer.org> To: Achim Patzner <ap@bnc.net> Cc: freebsd-smp@freebsd.org Subject: Re: Dual Xeon 2.8 with HT - How is the support in FreeBSD 5.3 Message-ID: <41DDBF60.2010203@elischer.org> In-Reply-To: <72A47422-602B-11D9-8D39-000A95A0BB90@bnc.net> References: <001b01c4f40e$e7b206a0$0a0110ac@emea.sykes.com> <41DD6D2D.5040308@rhondasworld.com> <001001c4f411$fc6efcd0$0a0110ac@emea.sykes.com> <41DDACFB.7080302@elischer.org> <72A47422-602B-11D9-8D39-000A95A0BB90@bnc.net>
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Achim Patzner wrote: > > Am 06.01.2005 um 22:26 schrieb Julian Elischer: > >>> then i wiill try it with HT enabled and hope for the best. >> >> The biggest problem is that it will slow your system down.. > > > I'd not agree on this for every available CPU; I just finished some > extensive test using XEON 3,6 GHz and there is no noticeable > difference between running the Intel SE7520BD2 with two processors > enabled (and HT disabled) or one processor and HT. Ok, maybe the board > isn't that good (it was a severe mistake ordering it as the second NIC > (Intel Yukon) is wasted space)... this is true but the original author specified he's using the 2.8GHz CPUs. > > >> one of them should be doing Floating Point ops while the other is >> doing integer.. (they share the integer ALU I believe). > > > Not anymore; the latest XEONs finally have enough brains in their skull. > >> There are apps that do ok, but for example compiles get slowed down >> as the virtual CPUs flush each other's cache entries out and contest >> for the ALU. > > > Especially doing a "make buildworld" was faster with HT turned on > while ubench was suffering quite a bit. > > > Achim > > PS: I would by those machines again - this time with an SE7520AF > mainboards. > PPS: Of course they are doing much better runnig an amd64 kernel. > > _______________________________________________ > freebsd-smp@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-smp > To unsubscribe, send any mail to "freebsd-smp-unsubscribe@freebsd.org"
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