> Von: Wendy Cheng [[email protected]] > Gesendet: Montag, 9. September 2013 22:03 > An: Markus Stockhausen > Cc: [email protected] > Betreff: Re: Strange NFS client ACK behaviour > > On Sun, Sep 8, 2013 at 11:24 AM, Markus Stockhausen > <[email protected]> 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
Thanks for pointing into that direction. From my understanding this patch goes into the NFS client side. I built a patched module for my Fedora 19 client (3.10 kernel). Nevertheless the behaviour ist still the same. If I get the patch right it is about forked childs that access a page of a mmapped file round robin and the kernel issues tons of write requests to the file. My case is only about ACK transmissions for a single writer. Markus
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