I am using Debian lenny in Dom0. Disk is a two disk md raid1. DomUs have
physical lvm.
It seems no matter how I assign the affinity in the DomUs:- top on Dom0
shows cpu0 is "clogged up" with typically 0%id 80%wa yet cores 1-3 are
99.7%id. eg:
top - 09:20:07 up 11 days, 10:05, 2 users, load average: 0.28, 0.07, 0.06
Tasks: 117 total, 1 running, 116 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.3%us, 7.0%sy, 0.0%ni, 6.7%id, 86.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu2 : 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu3 : 0.0%us, 0.0%sy, 0.0%ni, 98.0%id, 2.0%wa, 0.0%hi, 0.0%si,
0.0%st
Mem: 3442688k total, 2419176k used, 1023512k free, 837112k buffers
Swap: 39061944k total, 152k used, 39061792k free, 1189380k cached
Here is the configuration:
Name ID VCPU CPU State Time(s) CPU
Affinity
Domain-0 0 0 1 -b- 11836.7 any cpu
Domain-0 0 1 3 -b- 1326.2 any cpu
Domain-0 0 2 2 r-- 2943.1 any cpu
Domain-0 0 3 0 -b- 3384.9 any cpu
debian 20 0 2 -b- 34.7 1-3
edubuntu 18 0 3 -b- 19.6 1-3
gos 17 0 3 -b- 19.6 1-3
ltsp 15 0 2 -b- 14.4 1-3
Is it possible to spread the load (particularly io) in Dom0 over the 4
cores?
Thanks,
Berni
PS: As an aside I have used tasksel to move the backup job in Dom0 onto
core 3 - that does seem to load up cpu0 and 3 more evenly.
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