Date: Thu, 13 Jan 2005 20:52:10 +0100 From: Anthony Atkielski <atkielski.anthony@wanadoo.fr> To: freebsd-questions@freebsd.org Subject: Re: Hyperthreading hurts 5.3? Message-ID: <1242214203.20050113205210@wanadoo.fr> In-Reply-To: <41E65688.4010700@netfence.it> References: <200501121049.j0CAnJQe028309@mp.cs.niu.edu> <828997113.20050112184556@wanadoo.fr> <41E58E53.7060606@netfence.it> <786252184.20050113014354@wanadoo.fr> <41E65688.4010700@netfence.it>
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Andrea Venturoli writes: AV> Not exactly the same algorithm and on different set of data. But similar machine instructions, perhaps? AV> Yes. Just the contention for the FPU alone might have had the effect of single-threading the workload. That plus the SMP overhead might give you a zero or negative gain with HT. AV> In the past. AV> Nowadays they have some sort of protection. Unfortunately, AMD lost my business when the first processor nearly burst into flames. I try not to make the same mistake twice. And I've seen examples of AMD processors that _have_ burst into flames, so why take a chance? For me the weakest parts of any machine are the fans and the disk drives, because they have to move. -- Anthony
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