10G network netperf performance (ix)

[Sepherosa Ziehau]

Hi all,

Following stats are for folks interested in DragonFly's TCP netperf
performance on 10G network (as of 9f1b012):

Testing system hardware:
Host: i7-3770 w/ hyperthreading enabled, dual channel DDR3-1600 memory (8GB x 2)
NIC: Intel 82599ES (connected w/ Intel XDACBL1M direct attach cable)

TSO burst size is default to 12000B for DragonFly's ix.

+-------+              +-------+
|       |              |       |
|       | ix0 ---- ix0 |       |
|   A   |              |   B   |
|       | ix1 ---- ix1 |       |
|       |              |       |
+-------+              +-------+

B runs 'netserver -N'

1) TCP_STREAM (total 18840Mbps, 2 ports, 5 run average):

   tcp_stream -H B0 -i 64 -l 60 &
   tcp_stream -H B1 -i 64 -l 60

   The above commands starts 128 netperf TCP_STREAM tests to B0 and B1.

   The results:
   ~9424Mbps on for each set of test, i.e. total 18840Mbps (5 run average).
   Jain's fairness index for each set of test > 0.85 (1.0 is the best).

   CPU usage statistics:
   On TX side (A): ~25% sys, ~2% user, ~7% intr.  Almost no contention.
   On RX side (B): ~35% sys, ~3% user, ~10% intr.  Mainly contended on rcvtok.
   Interrupt rate is ~16000 on each CPU (interrupt moderation is
default to 8000hz for DragonFly's ix)

2) TCP_STREAM + TCP_MAERTS (total 37279Mbps, 2 ports, 5 run average):

   tcp_stream -H B0 -i 32 -l 60 &
   tcp_stream -H B1 -i 32 -l 60 &
   tcp_stream -H B0 -i 32 -l 60 -r &
   tcp_stream -H B1 -i 32 -l 60 -r

   The above commands starts 64 netperf TCP_STREAM and 64 TCP_MAERTS
tests to B0 and B1.

   The results:
   ~9220Mbps - ~9400Mbps for each set of test, i.e. total 37279Mbps (5
runs average)
   Jain's fairness index for each set of test > 0.80 (1.0 is the best).

   CPU usage statistics:
   ~75% sys, ~4% user, ~20% intr.  Mainly contended on rcvtok.  The
tests are CPU limited.  System is still responsive during the test.
   Interrupt rate is ~16000 on each CPU (interrupt moderation is
default to 8000hz for DragonFly's ix)

Best Regards,
sephe

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Tomorrow Will Never Die