Date: Thu, 19 Jan 2012 10:23:28 -0500 From: John Baldwin <jhb@freebsd.org> To: davidxu@freebsd.org Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r230201 - head/lib/libc/gen Message-ID: <201201191023.28426.jhb@freebsd.org> In-Reply-To: <4F17B0DE.3060008@gmail.com> References: <201201160615.q0G6FE9r019542@svn.freebsd.org> <4F178CDC.3030807@gmail.com> <4F17B0DE.3060008@gmail.com>
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On Thursday, January 19, 2012 12:57:50 am David Xu wrote: > rdtsc() may not work on SMP, so I have updated it to use clock_gettime > to get total time. > http://people.freebsd.org/~davidxu/bench/semaphore2/ > <http://people.freebsd.org/%7Edavidxu/bench/semaphore2/>; > > Still, lfence is a lot faster than atomic lock. http://www.freebsd.org/~jhb/patches/amd64_fence.patch This the patch I've had for quite a while. Can you retest with this? You'll probably have to install the updated header in /usr/include as well. -- John Baldwin
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