Re: [PATCH v2 6/8] kvm tools: Add rwlock wrapper

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On 05/30/2011 03:36 PM, Ingo Molnar wrote:
You are probably right about 1024 CPUs.

Right now i can produce something similar to it: 42 vcpus on a single
CPU:

	$ taskse 1 kvm run --cpus 42

And that hangs early on during bootup, around:

[    0.236000] Disabled fast string operations
[    0.242000]  #4
[    0.270000] Disabled fast string operations
[    0.275000]  #5
[    0.317000] Disabled fast string operations
[    0.322000]  #6
[    0.352000] Disabled fast string operations
[    0.358000]  #7
[    0.414000] Disabled fast string operations

The threads seem to be livelocked:

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
22227 mingo     20   0  471g  95m  904 R 12.9  0.8   0:06.39 kvm
22230 mingo     20   0  471g  95m  904 R 12.9  0.8   0:06.36 kvm
22226 mingo     20   0  471g  95m  904 R 11.9  0.8   0:07.04 kvm
22228 mingo     20   0  471g  95m  904 R 11.9  0.8   0:06.38 kvm
22229 mingo     20   0  471g  95m  904 R 11.9  0.8   0:06.37 kvm
22231 mingo     20   0  471g  95m  904 R 11.9  0.8   0:06.37 kvm
22232 mingo     20   0  471g  95m  904 R 11.9  0.8   0:06.36 kvm
22233 mingo     20   0  471g  95m  904 R 11.9  0.8   0:06.33 kvm
     7 root      -2  19     0    0    0 S  2.0  0.0   1:12.53 rcuc0

with no apparent progress being made.


Well, strangely, 42-on-1 booted for me in qemu, and only got ridiculously slow in initrd. Three minutes and it's still booting.

I don't really see how tools/kvm could cause this slowness, though.

--
error compiling committee.c: too many arguments to function

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