Re: UDP and e1000 : Simple test, little bugs.

[Ben Greear <greearb@candelatech.com>]

Vincent Roqueta wrote:
> Hello all,
> 
> I am working on NFS interoperabiity and I experiment some problems with UDP. 
> The problem appear between the linux 2.6.10rc1 and 2.6.10rc2, and is still 
> present in the last kernel (2.6.11rc3)
> 
> With NFSv3:
> Client send a 32k file splited into 22 IP fragments. The problem is the server 
> only receive 17 fragments.
> More investigation tell me that the server reveive 17 fragments because the 
> client only send 17  IP fragments.
> 
> As the NFS client code is exactly the same between the 2.6.10rc1 and 2.6.10rc2 
> I tried to write a simple UDP client server, to be sure there is no relation 
> between this bug and NFS.
> 
> Client create a buffer of X bytes and fill it with the 'A' symbol. Then it 
> write it over a udp socket (sendto).
> Server read the first 1024KB sent.
> 
> If X is <26000 the write is done with sucess.
> Else it fail. (Typicaly for a 32KB size, as for NFS)

Try setting the socket send buffer size larger.  By default it's
quite small, and so it may not accept a large UDP frame.

Ben


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com