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

[JimWright]

TimGardner - From your dmesg output it appears your bare metal test was
running kernel version 2.6.35, is that correct?  Also the stack trace
looks noticeable different.  Is there an easy way I can test that kernel
version on my 10.04 LTS setup (i.e. is there a package I can install on
Lucid Lynx)?

We also experience this lockup on bare metal which is currently making
us very nervous about using NFS for large files.  I only produced the
virtual machine test case to try and constrain the possible variables
that may trigger the bug.  What parameters did you use for your VM
(CPUs/RAM/HDD and Ubuntu & Kernel versions)?  BTW I was never able to
reproduce the issue with a single CPU, I have always needed multiple
CPUs.

I also noticed another difference between your dd test and my gzip test
(in addition to the generating CPU load issue I mentioned before) - my
gzip process both reads and writes from the NFS mount, whilst your dd
only writes.  I will see if I can reproduce the issue on my VM using
your dd test.

Jim

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