From: Hirokazu Takahashi <taka@valinux.co.jp>
Subject: Re: Re: [PATCH] zerocopy NFS for 2.5.36
Date: Fri, 18 Oct 2002 01:26:18 +0900 (JST)
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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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