How can I disable hyperthreads, but NOT smp ?
jusher71 at yahoo.com
Tue Sep 20 20:46:58 UTC 2011
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:
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 ?
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