On Sun, Sep 8, 2013 at 11:24 AM, Markus Stockhausen
<stockhau...@collogia.de> wrote:

>> > we observed a performance drop in our IPoIB NFS backup
>> > infrastructure since we switched to machines with newer
>> > kernels.
>

Not sure how your backup infrastructure works but the symptoms seem to
match with this discussion:
http://www.spinics.net/lists/linux-nfs/msg38980.html

If you know how to recompile nfs kmod, Trond's patch does worth a try.
Or open an Ubuntu support ticket, let them build you a test kmod.

-- Wendy
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