>-----Original Message-----
>From: Ouyang, Lane (NSN - CN/Hangzhou)
>[mailto:lane.ouy...@nsn.com]
>Sent: Friday, June 13, 2014 2:04 AM
>To: Tantilov, Emil S; Xu, Gang 1. (NSN - CN/Hangzhou);
>e1000-devel@lists.sourceforge.net
>Cc: Ni, Zhenglin (NSN - CN/Hangzhou); Liu, Xin 9. (NSN -
>CN/Hangzhou); Yan, Liming (NSN - CN/Hangzhou); Liu, Zuofeng
>(NSN - CN/Hangzhou); Pajunpaa, Jussi (NSN - FI/Oulu)
>Subject: RE: [E1000-devel] Need Help about UDP multiple
>receive queue
>
>Hi Emil,
>
>The size of UDP packets is quite small, so they should not
>be fragmented.
>
>16:52:30.908413 IP 10.69.0.1.18890 > 10.69.9.81.3000: UDP,
>length 96
>16:52:30.908425 IP 10.69.0.1.42398 > 10.69.9.81.3000: UDP,
>length 96
...
Yeah, the packets look OK.
>
>In Intel 82599 10 Gbe Controller Datasheet, it tells,
>
>"
>Enabling rules:
>* RSS is enabled in the MRQC register.
>* |>***********RSS enabling cannot be done dynamically while it must be
>preceded by a software reset.************<|
>* RSS status field in the descriptor write-back is enabled when the
>RXCSUM.PCSD bit is
>set (fragment checksum is disabled). RSS is therefore mutually exclusive with
>UDP
>fragmentation checksum offload. * Support for RSS is not provided when legacy
>receive
>descriptor format is used."
>
>Before we execute the command " ethtool -N fi0 rx-flow-hash
>udp4 sdfn "
>
>Register MRQC has value 330001
>0x05818: MRQC (Multiple Rx Queues Command)
>0x00330001
>
>After we execute the command,
>
>Register MRQC has value 730001
>0x05818: MRQC (Multiple Rx Queues Command)
>0x00330001
>
>I wonder, should we do any software reset after executing
>the above command? And how to do a software reset? Please
>advice...
You can just do `ifconfig ethX down; ifconfig ethX up` and see if the packets
are distributed differently after that.
Also you can do a quick test using netperf:
for ((i=0; i<5; i++))
do
netperf -H $host -t UDP_SREAM &
done
and check the queue distribution on the $host.
Thanks,
Emil
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