Date: Fri, 31 Jan 2003 17:19:34 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: John Baldwin <jhb@FreeBSD.org> Cc: smp@FreeBSD.org Subject: RE: cvs commit: src/sys/i386/i386 mp_machdep.c Message-ID: <XFMail.20030131171934.jhb@FreeBSD.org> In-Reply-To: <XFMail.20030130114117.jhb@FreeBSD.org>
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On 30-Jan-2003 John Baldwin wrote: > > On 30-Jan-2003 John Baldwin wrote: >> jhb 2003/01/30 08:38:17 PST >> >> Modified files: (Branch: RELENG_4) >> sys/i386/i386 mp_machdep.c >> Log: >> MFC: Basic support for Hyperthreading. This uses the values from cpuid to >> enmuerate logical CPUs. >> >> Requested heavily by: ps > > I highly recommend turning on machdep.cpu_idle_hlt for HTT boxes as it > provides a noticable performance improvement. I'm still testing some > other patches to rework the locking code in 4.x to make use of the pause > instruction and be more intelligent about spinning on locks in general. Well, the pause instruction does seem to be helping considerably. I'd like for people to test this patch on SMP machines running 4.x, not just Pentium 4's with HT but P3's, PPro's, etc. as well. http://www.FreeBSD.org/~jhb/patches/htt.patch Thanks. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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