[Bug 561210] Re: Writing big files to NFS target causes system lock up

[Timo Harmonen]

I tried adjusting vm.min_free_kbytes, and also those other settings
suggested by Alex. They didn't seem to have any impact, still the test
script hanged as earlier. I tried with 8080, 65536 and 80800, and also
with the suggested TCP settings.

It seems that I can repro this case 100% with my wget test script. I
have now run it total of 9 times, and at minimum it has taken 18
downloads in 77 seconds and at maximum 264 downloads in 1120 seconds
before nfs gets stalled. I have attached the script in case that would
help in trying to repro the problem (sorry for abusing ubuntu.com in
testing :)). There shouldn't be anything special in my system setup,
except that I run everything under kvm.


** Attachment added: "nfstest-dl.sh"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/561210/+attachment/1554331/+files/nfstest-dl.sh

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Writing big files to NFS target causes system lock up
https://bugs.launchpad.net/bugs/561210
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