Date: Wed, 01 May 2002 16:15:28 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: freebsd-smp@freebsd.org Subject: RE: hlt when idle? Message-ID: <XFMail.20020501161528.jhb@FreeBSD.org> In-Reply-To: <15567.62317.677224.3470@grasshopper.cs.duke.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
On 01-May-2002 Andrew Gallatin wrote: > > > Can somebody remind me why we do not hlt in the idle loop on MP x86s? > Is this because a HLTed CPU is not going to notice a new runnable job > (possibly migrating from another CPU) until it gets an interrupt to > wake it up? Yes. > Do both CPUs get clock interrupts on x86? No, the interrupts seem to be round-robin, but each clock intr is only sent to one CPU unlike on alpha where they are broadcast. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ 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?XFMail.20020501161528.jhb>