Re: pinning, tsc and apic

[Ryan Harper <ryanh@us.ibm.com>]

* Chris Wright <chrisw@sous-sol.org> [2008-05-15 02:01]:
> * Anthony Liguori (anthony@codemonkey.ws) wrote:
> >  From a quick look, I suspect that the number of wildly off TSC 
> > calibrations correspond to the VMs that are misbehaving.  I think this 
> > may mean that we have to re-examine the tsc delta computation.
> > 
> > 10_serial.log:time.c: Detected 1995.038 MHz processor.
> > 11_serial.log:time.c: Detected 2363.195 MHz processor.
> > 12_serial.log:time.c: Detected 2492.675 MHz processor.
> > 13_serial.log:time.c: Detected 1995.061 MHz processor.
> > 14_serial.log:time.c: Detected 1994.917 MHz processor.
> > 15_serial.log:time.c: Detected 4100.735 MHz processor.
> > 16_serial.log:time.c: Detected 2075.800 MHz processor.
> > 17_serial.log:time.c: Detected 2674.350 MHz processor.
> > 18_serial.log:time.c: Detected 1995.002 MHz processor.
> > 19_serial.log:time.c: Detected 1994.978 MHz processor.
> > 1_serial.log:time.c: Detected 4384.310 MHz processor.
> 
> Is this with pinning?  We at least know we're losing small bits on
> migration.  From my measurements it's ~3000 (outliers are 10-20k).
> 
> Also, what happens if you roll back to kvm-userspace 7f5c4d15ece5?

I'll try that next.

> 
> I'm using this:
> 
On tip, using the patch, I still see hosed guests and tons of apic round
robin output, but the tsc calc seems to have stablized:

/tmp/10_serial.log:time.c: Detected 1995.018 MHz processor.
/tmp/11_serial.log:time.c: Detected 1995.009 MHz processor.
/tmp/12_serial.log:time.c: Detected 1995.012 MHz processor.
/tmp/13_serial.log:time.c: Detected 1995.013 MHz processor.
/tmp/14_serial.log:time.c: Detected 1995.016 MHz processor.
/tmp/15_serial.log:time.c: Detected 1995.020 MHz processor.
/tmp/16_serial.log:time.c: Detected 1995.020 MHz processor.
/tmp/18_serial.log:time.c: Detected 1995.020 MHz processor.
/tmp/19_serial.log:time.c: Detected 1995.023 MHz processor.
/tmp/1_serial.log:time.c: Detected 1995.008 MHz processor.
/tmp/20_serial.log:time.c: Detected 1995.011 MHz processor.
/tmp/21_serial.log:time.c: Detected 1995.016 MHz processor.
/tmp/22_serial.log:time.c: Detected 1995.016 MHz processor.
/tmp/23_serial.log:time.c: Detected 1995.013 MHz processor.
/tmp/24_serial.log:time.c: Detected 1995.018 MHz processor.
/tmp/25_serial.log:time.c: Detected 1995.030 MHz processor.
/tmp/26_serial.log:time.c: Detected 1995.021 MHz processor.
/tmp/27_serial.log:time.c: Detected 1995.026 MHz processor.
/tmp/28_serial.log:time.c: Detected 1995.016 MHz processor.
/tmp/29_serial.log:time.c: Detected 1995.012 MHz processor.
/tmp/2_serial.log:time.c: Detected 1995.020 MHz processor.
/tmp/30_serial.log:time.c: Detected 1995.021 MHz processor.
/tmp/31_serial.log:time.c: Detected 1995.021 MHz processor.
/tmp/32_serial.log:time.c: Detected 1995.008 MHz processor.
/tmp/33_serial.log:time.c: Detected 1995.015 MHz processor.
/tmp/34_serial.log:time.c: Detected 1995.018 MHz processor.
/tmp/35_serial.log:time.c: Detected 1995.017 MHz processor.
/tmp/36_serial.log:time.c: Detected 1995.013 MHz processor.
/tmp/37_serial.log:time.c: Detected 1995.003 MHz processor.
/tmp/38_serial.log:time.c: Detected 1995.036 MHz processor.
/tmp/39_serial.log:time.c: Detected 1995.020 MHz processor.
/tmp/3_serial.log:time.c: Detected 1995.017 MHz processor.
/tmp/40_serial.log:time.c: Detected 1994.998 MHz processor.
/tmp/41_serial.log:time.c: Detected 1995.015 MHz processor.
/tmp/43_serial.log:time.c: Detected 1995.007 MHz processor.
/tmp/44_serial.log:time.c: Detected 1995.029 MHz processor.
/tmp/45_serial.log:time.c: Detected 1995.009 MHz processor.
/tmp/46_serial.log:time.c: Detected 1995.025 MHz processor.
/tmp/47_serial.log:time.c: Detected 1995.019 MHz processor.
/tmp/48_serial.log:time.c: Detected 1995.013 MHz processor.
/tmp/4_serial.log:time.c: Detected 1995.024 MHz processor.
/tmp/5_serial.log:time.c: Detected 1995.016 MHz processor.
/tmp/6_serial.log:time.c: Detected 1995.023 MHz processor.
/tmp/7_serial.log:time.c: Detected 1995.036 MHz processor.
/tmp/8_serial.log:time.c: Detected 1995.013 MHz processor.
/tmp/9_serial.log:time.c: Detected 1995.014 MHz processor.

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@us.ibm.com

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