Date: Tue, 4 Feb 2003 04:17:53 +0000 From: Chris Luke <chrisy@flix.net> To: Brendon and Wendy <brendy33@attbi.com> Cc: freebsd-smp@freebsd.org Subject: Re: mp_machdep.c patch Message-ID: <20030204041753.GA17107@flix.net> In-Reply-To: <200302032001.23528.brendy33@attbi.com> References: <200302032001.23528.brendy33@attbi.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Brendon and Wendy wrote (on Feb 04): > Question - how does one determine whether the hyperthreading working? My DMESG > is below, as well as output from top. Booting with HTT disabled looks the > same to me. Simple visual method: run "top". On SMP systems with SMP active it displays an extra column displaying the CPU number that a given process last ran or is running on. Each HT instance gets its own CPU number, as listed in dmesg. For example (from an old Quad Xeon): PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND 332 mysql 2 0 32032K 13316K poll 2 42.6H 2.83% 2.83% mysqld 12808 chrisy 28 0 1968K 1148K CPU3 1 0:00 14.86% 1.42% top 12805 chrisy 18 0 1320K 1004K opause 0 0:00 1.75% 0.24% tcsh 12802 root 2 0 4852K 1448K sbwait 3 0:00 0.66% 0.15% sshd 194 namedb 2 0 14564K 13832K select 3 98:23 0.00% 0.00% named Note the "C" column. I'm finding that unlike on MP boards, where you see a more or less even distribution of processes across the procesors, on a HT system, mostly stuff sits on CPU0 with occasional showings of CPU1. (This is alongside my 2nd CPU not firing up, but I'll followup with more on that tomorrow). Chris. -- == chrisy@flix.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030204041753.GA17107>