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CColl13
Beginner
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10GE TX/RX performance issues

Hi,

We have a number of Intel 82599EB 10-Gigabit dual port NICs running in a number of servers. On a couple of these servers, we are seeing very strange behaviour where when connecting via a Brocade 1G/10G switch from a 1G server we are getting line speed RX (113MB/s) but only a fraction of this TX, for example:

# ./netperf -H XXX.XXX.XXX.XXX -f M

 

MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to XXX.XXX.XXX.XXX () port 0 AF_INET

 

Recv Send Send

 

Socket Socket Message Elapsed

 

Size Size Size Time Throughput

 

bytes bytes bytes secs. MBytes/sec

2097152 65536 65536 10.14 113.16

# ./netperf -H XXX.XXX.XXX.XXX -f M -t TCP_MAERTS

 

MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to XXX.XXX.XXX.XXX () port 0 AF_INET

 

Recv Send Send

 

Socket Socket Message Elapsed

 

Size Size Size Time Throughput

 

bytes bytes bytes secs. MBytes/sec

87380 2097152 2097152 10.00 20.38

We have another server with the same card and that behaves as expected (line speed both TX and RX). As far as I can tell all network configs are the same on both boxes. We've tried different switch, cable, OS and server hardware.

Am I missing something really obvious here?!

Thanks,

Chris

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