netperf

[Christian Helmuth]

Sebastian,

On Tue, Jan 28, 2014 at 01:07:19PM +0100, Sebastian Sumpf wrote:
> Thanks for your tests! But I don't like the 65 MBit/s thing! What is
> going on? Is this RX or TX?

Complete netperf output follows

---------------------------- TCP_STREAM -----------------------
spawn netperf-2.6.0 -H 10.0.0.65 -P 1 -v 2 -t TCP_STREAM -c -C -- -m 1024 
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.65 () port 0 AF_INET
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % U      us/KB   us/KB

 87380  16384   1024    10.02        65.59   34.95    -1.00    174.598  -1.249 

Alignment      Offset         Bytes    Bytes       Sends   Bytes    Recvs
Local  Remote  Local  Remote  Xfered   Per                 Per
Send   Recv    Send   Recv             Send (avg)          Recv (avg)
    8       8      0       0 82158592  1024.00     80233   8905.12   9226

Maximum
Segment
Size (bytes)
  1448

calculation: overall bytes / size per packet / time = packets per second
             82158592 Bytes / 1024 Bytes / 10.02 s =     8007 packets/s

! PERF: TCP_STREAM              65.59 MBit/s ok

---------------------------- TCP_MAERTS -----------------------
spawn netperf-2.6.0 -H 10.0.0.65 -P 1 -v 2 -t TCP_MAERTS -c -C -- -m 1024 
MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.65 () port 0 AF_INET
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Recv     Send     Recv    Send
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % U      us/KB   us/KB

 87380  16384   1024    10.00       543.35   39.06    -1.00    23.555  -0.151 

Alignment      Offset         Bytes    Bytes       Recvs   Bytes    Sends
Local  Remote  Local  Remote  Xfered   Per                 Per
Recv   Send    Recv   Send             Recv (avg)          Send (avg)
    8       8      0       0 679280808  13875.90     48954   16384.00  41474

Maximum
Segment
Size (bytes)
  1448

calculation: overall bytes / size per packet / time = packets per second
             679280808 Bytes / 1024 Bytes / 10.00 s =    66336 packets/s

! PERF: TCP_MAERTS              543.35 MBit/s ok


The manual states

  TCP_STREAM  It is quite simple, transferring some quantity of data
              from the system running netperf to the system running
              netserver.
  TCP_MAERTS  A TCP_MAERTS (MAERTS is STREAM backwards) test is “just
              like” a TCP_STREAM test except the data flows from the
              netserver to the netperf. 

So, the scenario is much slower if the Genode side is _receiving_.

Regards
-- 
Christian Helmuth
Genode Labs

http://www.genode-labs.com/ · http://genode.org/
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