Date: Fri, 27 May 2005 18:05:48 +0400 From: Dmitry Mityugov <dmitry.mityugov@gmail.com> To: Jacob S <stormspotter@6texans.net> Cc: freebsd-questions@freebsd.org Subject: Re: Problem with HT support in 5.4 Message-ID: <b7052e1e05052707056d4faa4@mail.gmail.com> In-Reply-To: <20050527085445.38de5553@jacob.6texans.net> References: <20050527085445.38de5553@jacob.6texans.net>
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On 5/27/05, Jacob S wrote: > Hello list, >=20 > I upgraded a few 5.3 servers to 5.4 yesterday and everything seemed to > go well. After booting the new kernel, dmesg correctly showed 2 logical > cpus (1 xeon with HT). >=20 > However, when I look at top's output, it always shows at least 50% cpu > idle time - even when the load is above 10. To confirm this, I ran > burnP6 from the cpuburn port - even with over a hundred apache processes > going, exim running and a few other things, top still reported the cpu > as 50% idle. The 'C' column in top, between 'State' and 'Time' also > shows everything as being run on cpu 0. >=20 > `ps ax | grep cpu` reports this: > 11 ?? RL 0:00.00 [idle: cpu1] > 12 ?? RL 931:45.24 [idle: cpu0] > 108 ?? DL 0:04.02 [schedcpu] >=20 > So it looks like smp support is enabled and it sees the HT enabled > processor, but it's not using the second logical cpu. Is there something > I missed in compiling the kernel, or is this a bug? I have confirmed it > on two 5.4 servers now. Oh, wait, it is probably just the last HT security patch, ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc. Dmitry
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