Date: Wed, 23 Nov 2005 08:51:57 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-current@freebsd.org Cc: Kris Kennaway <kris@obsecurity.org> Subject: Re: idle task running on the wrong CPU Message-ID: <200511230851.58629.jhb@freebsd.org> In-Reply-To: <20051123090334.GA90972@xor.obsecurity.org> References: <20051123090334.GA90972@xor.obsecurity.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wednesday 23 November 2005 04:03 am, Kris Kennaway wrote: > On 6.0-STABLE: > > PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND > 13 root 1 171 52 0K 8K CPU1 0 0:00 100.00% idle: > cpu1 > > Note: the cpu1 idle task is running on CPU 0. Actually it is not > running, since it's not accumulating any CPU time, and in fact nothing > at all is being scheduled on CPU 1. It is running, but is not accumulating time because it sits in a hlt loop. Also, the 'state == CPU1' means it is running on CPU1. The 'C' column is the column for the CPU this process last ran on. If this is a HT CPU disabled by default during boot, then that thread has yet to perform a context switch, and all threads start off when they are created with the lastcpu being CPU 0, so it won't update the 'C' column until it actually does a context switch. I'm not sure why it is not accumulating time, however. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200511230851.58629.jhb>