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xen-devel
RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
Further testing:
A brief update the DomU "crash for large VCPU count"
For PCPU == 2 (single Core 2 Duo/965 platform) host machine hangs for
with VCPU's > 20.
For PCPU == 8 (Dual quadcore/Bensley)
we have tested up to 24 VCPU successfully. However, we've seen FC6
rebooting the DomU sporadically with VCPU > 16. The suggested
clock_source option has no effect.
-----Original Message-----
From: Woller, Thomas [mailto:thomas.woller@xxxxxxx]
Sent: Wednesday, January 24, 2007 11:35 AM
To: Zulauf, John; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
Not sure if this is useful. We have a box with 8 cores, and can run 32
VCPUs without issue on AMD-V with suse10 64b smp guest.
This data though is from around january 8th, so it's a bit stale. I
don't have the exact c/s that the tests were run on, or the guest config
parms, but I think it was with 6Gig of RAM for the guest. :P I can try
this guest again next day or 2 if useful.
tom
XEND_DEBUG = 1
Name ID VCPU CPU State Time(s) CPU
Affinity
Domain-0 0 0 0 -b- 172.5 any cpu
Domain-0 0 1 1 -b- 60.0 any cpu
Domain-0 0 2 3 -b- 25.2 any cpu
Domain-0 0 3 3 r-- 10.2 any cpu
Domain-0 0 4 2 -b- 8.7 any cpu
Domain-0 0 5 5 -b- 6.8 any cpu
Domain-0 0 6 6 -b- 3.6 any cpu
Domain-0 0 7 0 -b- 4.8 any cpu
suse10_x64_smp 4 0 6 -b- 144.2 any cpu
suse10_x64_smp 4 1 4 -b- 36.3 any cpu
suse10_x64_smp 4 2 4 -b- 26.5 any cpu
suse10_x64_smp 4 3 3 --- 883.8 any cpu
suse10_x64_smp 4 4 5 r-- 885.6 any cpu
suse10_x64_smp 4 5 6 --- 883.6 any cpu
suse10_x64_smp 4 6 7 --- 884.2 any cpu
suse10_x64_smp 4 7 2 --- 884.4 any cpu
suse10_x64_smp 4 8 4 --- 886.8 any cpu
suse10_x64_smp 4 9 7 r-- 885.6 any cpu
suse10_x64_smp 4 10 6 --- 885.2 any cpu
suse10_x64_smp 4 11 4 r-- 884.0 any cpu
suse10_x64_smp 4 12 0 r-- 884.6 any cpu
suse10_x64_smp 4 13 3 --- 883.7 any cpu
suse10_x64_smp 4 14 1 --- 887.0 any cpu
suse10_x64_smp 4 15 1 --- 884.7 any cpu
suse10_x64_smp 4 16 0 --- 885.5 any cpu
suse10_x64_smp 4 17 7 --- 884.2 any cpu
suse10_x64_smp 4 18 2 r-- 885.9 any cpu
suse10_x64_smp 4 19 1 --- 886.0 any cpu
suse10_x64_smp 4 20 6 --- 885.7 any cpu
suse10_x64_smp 4 21 6 --- 886.4 any cpu
suse10_x64_smp 4 22 2 --- 885.6 any cpu
suse10_x64_smp 4 23 5 --- 888.9 any cpu
suse10_x64_smp 4 24 4 --- 885.0 any cpu
suse10_x64_smp 4 25 0 --- 885.2 any cpu
suse10_x64_smp 4 26 4 --- 885.0 any cpu
suse10_x64_smp 4 27 7 --- 885.1 any cpu
suse10_x64_smp 4 28 4 --- 882.4 any cpu
suse10_x64_smp 4 29 6 --- 884.1 any cpu
suse10_x64_smp 4 30 5 --- 883.6 any cpu
suse10_x64_smp 4 31 1 r-- 885.3 any cpu
________________________________
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Zulauf, John
Sent: Wednesday, January 24, 2007 12:57 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Dom0 Hang for large VCPU counts > PCPU
We have been experimenting with large VCPU counts >> PCPU and
have succeeded in hanging Dom0 in or during /sbin/loader.
Using xen-3.0.4-testing with an HVM booting the FC6 DVD on a
Core2 Duo (i.e. 2 PCPU) on a 965 chipset
VCPU=17 - works
VCPU=20 - works (takes a very long time)
VCPU=24 - lockup (whole machine, yes I mean Dom0)
VCPU=31 - same
VCPU=32 - same
We've noted in the Xen l-apic code a hard 32 CPU limit (a uint32
used as an l-apic (vcpu?) bitmask), but this looks to be unrelated.
John Zulauf
Intel Corporation
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