Date: Tue, 20 Sep 2011 13:34:42 -0700 (PDT) From: Jason Usher <jusher71@yahoo.com> To: freebsd-questions@freebsd.org Subject: How can I disable hyperthreads, but NOT smp ? Message-ID: <1316550882.13474.YahooMailClassic@web121217.mail.ne1.yahoo.com>
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FreeBSD 6.4-RELEASE system with two physical CPUs, each of which are HT capable. From dmesg: cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 cpu2 (AP): APIC ID: 6 cpu3 (AP): APIC ID: 7 I also see this: machdep.hyperthreading_allowed: 0 The problem is, I have reason to believe that my workload benefits greatly from SMP, but is not playing nicely with hyperthreading. That is, it is trying to farm out 4 things at a time to a cpu setup that really is only able to do two things at a time. How can I disable HT completely, but still retain ALL the benefits of SMP ? Thanks.
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