Date: Wed, 25 Apr 2007 12:41:20 +0100 From: Richard Tector <richardtector@thekeelecentre.com> To: Artem Kuchin <matrix@itlegion.ru> Cc: freebsd-stable@freebsd.org Subject: Re: Top not showing 4 cpus on 2 xeons with HT Message-ID: <462F3E60.7010109@thekeelecentre.com> In-Reply-To: <00e301c7872d$03e1db80$0c00a8c0@Artem> References: <00e301c7872d$03e1db80$0c00a8c0@Artem>
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Artem Kuchin wrote: > I am just wondering if it is normal. > I have two xeon processors with HT on each of them. > When loading kernel says that 4 cpu's are found, > but when i do top i can see only 0 or 2 in the C > column. never 1 or 3. Is it normal? > > FreeBSD 6.2-STABLE (cvsed 1 day ago) If I remember correctly, HT is disabled by default for security reasons but there should be a sysctl to enable it. I believe there is also a paper by Colin Percival on the issue. Note that in a lot of common loads, the use of HT with the standard scheduler does not yield any real benefits. Regards, Richard
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