RE: [Xen-devel] Time stopped

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Recreated the situation on non-PAE kernel on the same machine.

As I suspected.
 
> On Thu, 2005-10-13 at 18:29 +0100, Ian Pratt wrote:
> 
> > 
> > When the machine is in this state, what interrupt rate does 
> > /proc/interrupts show?
> x335b:~ # cat /proc/interrupts

You'll need to do this multiple times e.g. 10 seconds appart for us to
figure out the rate.

> > If you do a "sleep 1" how long does it sleep for?
> In this case, it slept for about 3 real minutes.

Interesting.
 
> > I presume both dom0 and the domU experience the time slow down?
> Correct. 
> > 
> > If you run something in the background that burns CPU does 
> it make a 
> > difference?
> I started LTP on dom0 ( and can see console outpu) and it 
> makes no difference.

I think a "while true; do true; done" might be more convincing, but LTP
is probably good enough.

> > In this case, what does xm list show as regards the CPU 
> time consumed 
> > by the domains?
> x335b:/tmp/ltp-full-20050804 # date
> Thu Oct 13 13:47:59 CDT 2005
> x335b:/tmp/ltp-full-20050804 # xm list
> Name              ID  Mem(MiB)  CPU  VCPUs  State   Time(s)
> Domain-0           0       495    -      4  r-----     96.5
> 11_create_0       73        16    3      1  -b----      0.3
> x335b:/tmp/ltp-full-20050804 # xm list
> Name              ID  Mem(MiB)  CPU  VCPUs  State   Time(s)
> Domain-0           0       495    -      4  r-----     96.5
> 11_create_0       73        16    3      1  -b----      0.3
> x335b:/tmp/ltp-full-20050804 # xm list
> Name              ID  Mem(MiB)  CPU  VCPUs  State   Time(s)
> Domain-0           0       495    -      4  r-----     96.5
> 11_create_0       73        16    3      1  -b----      0.3
> x335b:/tmp/ltp-full-20050804 #
> x335b:/tmp/ltp-full-20050804 # date
> Thu Oct 13 13:47:59 CDT 2005

I didn't expect this. Need to think some.

> > Can you narrow down which of the xm-tests actually 
> provoke's the bug?

Can you repro using just this test?

If you had a serial console and perfc=y enabled it would be interesting
to see the real interrupt rate from the xen debug console.

Ian

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