*** This bug is a duplicate of bug 879334 ***
https://bugs.launchpad.net/bugs/879334
I see the exact same thing as perpetualrabbit: client(s) experience nfs
lockup for several tens of seconds - of the server side ~5 nfs threads
killing the cpu.
This began on upgrading a client from 10.04 LTS to 12.04 LTS. The server
is Debian Squeeze with 3.2.0 backport kernel. The server has no issues
with Fedora 17 or previous versions of Ubuntu, each having their /home
dir on the server over NFS4.
It seems the problem arises with files of largish size. I first noticed
this watching a 10-minute Youtube-video, which I assumed creates a
temporary file somewhere under /home/$ME - the hang does not happen on
"private browsing".
This is to note, that I think this problem is specifically related to
Ubuntu. I had no such problems when Fedora was at kernel 3.2
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https://bugs.launchpad.net/bugs/1006446
Title:
nfs4 causes enormous load in ubuntu-server making it unusable
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