Date: Thu, 14 Mar 2002 13:40:38 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Kenneth Culver <culverk@alpha.yumyumyum.org> Cc: Steve Wingate <stevew@velosystems.net>, freebsd-smp@FreeBSD.ORG Subject: Re: Intel Xeon hyperthreading Message-ID: <3C9118D6.81B9FD62@mindspring.com> References: <20020314152326.H20147-100000@alpha.yumyumyum.org>
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Kenneth Culver wrote: > I don't know if anyone is working on that, but from what I could tell, in > a lot of cases, enabling the hyperthreading actually *decreased* > performance of a lot of multithreaded and single threaded apps. It requires extensive compiler support. If you read the Intel documentation on how to write a compiler that does the right things, it reads like a list of sixteen "don't do this thing GCC did, do this instead". So the answer is really a question... does the original poster have their patches to GCC ready so that we can compile code that tests hyperthreading? -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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