Date: Sat, 29 Mar 2003 13:05:39 +1100 From: Aristedes Maniatis <ari@ish.com.au> To: freebsd-stable@freebsd.org Subject: 4.8 hyperthreading changes Message-ID: <F07EDB4D-618A-11D7-B788-003065A9024A@ish.com.au> In-Reply-To: <20030328104638.T208@freebsdmall.com>
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From the 4.8 changes page I found this: > FreeBSD now has rudimentary support for HyperThreading (HTT). SMP > kernels with the HTT kernel option will detect and start up the > logical processors on HTT-capable machines. The logical processors > will be treated like additional physical processors for the purposes > of process scheduling. On the 4.7 deployment systems I am running I have dual Xeon CPUs with hyperthreading. They appear as 4 CPUs in 'top'. That would seems to indicate to me that FreeBSD is scheduling them as four separate processors, however the note from: http://www.freebsd.org/relnotes/4-STABLE/relnotes/i386/x19.html#KERNEL makes it seem like this is a new 4.8 feature. Should I be concerned about upgrading when 4.8 is released in order to obtain the benefits of better use of these CPUs? Ari Maniatis --------------------------> ish group pty ltd 7 Darghan St Glebe 2037 Australia phone +61 2 9660 1400 fax +61 2 9660 7400 http www.ish.com.au | email info@ish.com.au PGP fingerprint 08 57 20 4B 80 69 59 E2 A9 BF 2D 48 C2 20 0C C8
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