Re: telling real from HTT CPUs under xen?

[Andrew Doran <ad%netbsd.org@localhost>]

On Tue, Apr 28, 2009 at 01:07:00PM -0400, Thor Lancelot Simon wrote:

> On Tue, Apr 28, 2009 at 12:04:14PM -0500, david l goodrich wrote:
> > On Tue, Apr 28, 2009 at 12:43:19PM -0400, Thor Lancelot Simon wrote:
> > > 
> > > I can't run it under Xen -- it doesn't work.  I'll have to wait until I
> > > can reboot the machine to NetBSD/amd64 to check, I guess.
> > 
> > for whatever it's worth, it does work in Xen here, on 5.0_RC3.
> > cpu0 is a p4 with HTT, so dmesg shows a cpu0 and a cpu1.
> >   --david
> > 
> > esther# cpuctl list
> > Num  HwId Unbound LWPs Interrupts     Last change
> > ---- ---- ------------ -------------- ----------------------------
> > 0    0    online       intr           Tue Apr  7 11:19:37 2009
> 
> Ah, so I should expect only the physical CPUs to show up in cpuctl list,
> and then I can pluck the apid from the 'hwid' column?
> 
> Here is what I get when I run cpuctl list on my system (amd64 domU on
> xen 3.1.4, NetBSD-current):
> 
> Num  HwId Unbound LWPs Interrupts     Last change
> ---- ---- ------------ -------------- ----------------------------
> cpuctl: IOC_CPU_GETINFO: Inappropriate ioctl for device

Looks like kernel newer than cpuctl. I broke compat with -current, but not
with 5.0 and forgot to write a note to current-users.

Try 'cpuctl identify 0'. On a P4 system without HT (the BIOS needs upgrading
to make it work, doh) I get this:

cpu0: Cluster/Package ID 0

On a two core, four thread box you should get two threads reporting package
ID X and two reporting package ID Y.