At 04:51 PM 3/30/2008 -0700, Bill Unruh wrote:
>Are those on the same day?
Yes, same day. Uncorrelated to anything I can identify
or each other. Same story on all the boxes. Running
a hefty multi-system compile with heavy NFS and Samba
traffic does not produce these events, though it disturbs
the Windows boxes slightly when CPU goes to 100%.
>Which "linux" and which "windows" are those graphs since you
>have 2 linux and 2 windows clients.
That's the dual-core AMD 2.4GHz Athlon Tyan mobo whitebox
runing Centos 4.5 SMP kernel. Similar results on the
Dell Dimension 2400 2.4GHz Intel P4 running Centos 4.5
mono-processor kernel.
Windows is a dual-core 3.4GHz Pentium D Tyan mobo whitebox
running 2003 R2 SP2 standard server.
>As I said, seeing the
>peerstats files would be helpful (offset and roundtrip)
Might try them later, but I can't belive a high-quality
SMC switch is causing multi-millisecond delays. Just not
possible. Pings are all about 400 microseconds, consistent
but slightly different on each system. Round trip is
800 microseconds. Attaching the output from a bulk 'ntpq -p'
'ntptrace' script I have below. Note that's 'ntptrace'
version 4.1 since the 4.2 script has useless offset info.
>Also these graphs seem to have cut off the spikes. Are the
>spikes actaully higher or is that an illusion?
Higher. Sometimes 1ms, sometimes 5-6ms.
>(Note the spikes are hundreds of usec, not many msec)
That would be the ~1ms example, check out the other one.
remote refid st t when poll reach delay offset jitter
==============================================================================
Endrun CDMA
LOCAL(0) LOCAL(0) 10 l 18 64 377 0.000 0.000 0.015
*HOPF_S(0) .CDMA. 0 l 6 16 377 0.000 0.000 0.015
Centos 32
*eachna .CDMA. 1 u 3 16 377 0.683 -0.004 0.009
-tock.usno.navy. .USNO. 1 u 452 1024 377 20.678 1.432 2.822
+navobs1.wustl.e .GPS. 1 u 479 1024 377 50.136 -1.513 0.164
+time.nist.gov .ACTS. 1 u 471 1024 377 66.528 -1.708 0.156
-tick.ucla.edu .GPS. 1 u 432 1024 377 87.372 3.296 0.085
Ultra 10
*172.29.87.3 .CDMA. 1 u 11 16 377 0.869 -0.016 0.042
172.29.87.15: stratum 2, offset -0.000007, synch distance 0.00783
172.29.87.3: stratum 1, offset -0.000018, synch distance 0.00038, refid 'CDMA'
Ultra 80
*172.29.87.3 .CDMA. 1 u 4 16 377 0.942 -0.012 0.012
172.29.87.17: stratum 2, offset -0.000038, synch distance 0.00685
172.29.87.3: stratum 1, offset -0.000017, synch distance 0.00038, refid 'CDMA'
44p
*172.29.87.3 .CDMA. 1 u 13 16 377 0.809 -0.001 0.016
172.29.87.13: stratum 2, offset -0.000014, synch distance 0.00627
172.29.87.3: stratum 1, offset -0.000018, synch distance 0.00038, refid 'CDMA'
Centos 64
*172.29.87.3 .CDMA. 1 u 12 16 377 0.664 0.003 0.487
172.29.87.19: stratum 2, offset -0.000009, synch distance 0.00720
172.29.87.3: stratum 1, offset -0.000018, synch distance 0.00038, refid 'CDMA'
W2K3 64
*172.29.87.3 .CDMA. 1 u 4 16 377 0.734 0.053 0.014
172.29.87.20: stratum 2, offset -0.000060, synch distance 0.00650
172.29.87.3: stratum 1, offset -0.000019, synch distance 0.00038, refid 'CDMA'
XP 32 laptop
*172.29.87.3 .CDMA. 1 u 7 16 377 0.819 0.468 0.256
172.29.87.12: stratum 2, offset -0.000173, synch distance 0.00655
172.29.87.3: stratum 1, offset -0.000017, synch distance 0.00038, refid 'CDMA'
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