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SubjectRe: [NFS] Re: [PATCH] zerocopy NFS for 2.5.36
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Hi,

> > How about IP datagrams? You can see the IP fields in /proc/net/snmp
> > IP layer may also discard them.
>
> Server:
>
> Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams
> InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes
> ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates
> Ip: 1 64 4088714 0 0 720 0 0 4086393 12233109 2 0 0 0 0 0 0 0 6000000
>
> A Client:
>
> Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams
> InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes
> ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates
> Ip: 2 64 2115252 0 0 0 0 0 1115244 646510 0 0 0 1200000 200008 0 0 0 0

It looks fine.
Hmmm.... What version of linux do you use?

Congestion avoidance mechanism of NFS clients might cause this situation.
I think the congestion window size is not enough for high end machines.
You can make the window be larger as a test.
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