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Message-ID: <20080308114655.GB27074@one.firstfloor.org> Date: Sat, 8 Mar 2008 12:46:55 +0100 From: Andi Kleen <andi@...stfloor.org> To: Willy Tarreau <w@....eu> Cc: Andi Kleen <andi@...stfloor.org>, Chris Snook <csnook@...hat.com>, Andrew Buehler <abuehler.kernel@...il.com>, Frederik Deweerdt <deweerdt@...e.fr>, belcampo <belcampo@...net.nl>, linux-kernel@...r.kernel.org Subject: Re: Hyperthreading performance oddities > Well, in my experience, except for compiling, HT has always caused > massive slowdowns, especially on network-intensive applications. > Basically, network perf took a 20-30% hit, while compiling took What network workload? Networking tends to have a lot of cache misses and unless you're exceeding your memory bandwidth HT normally does well on such workloads because it can do other things while the CPU is waiting for loads. > 20-30% boost. But I must admit that I never tried HT on anything > more recent than a P4, maybe things have changed since. There's nothing more recent out yet (unless you're talking non x86), but there were many different P4 generations. In particular Prescott (90nm) was quite different from the earlier ones, but even before and after there were some improvements and changes. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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