netdev - Re: TCP communication for raw image transmission

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Date:	Thu, 5 Jan 2012 10:57:38 +0100
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org
Subject: Re: TCP communication for raw image transmission

2012/1/5 Eric Dumazet <eric.dumazet@...il.com>:
> Le jeudi 05 janvier 2012 à 10:48 +0100, Jean-Michel Hautbois a écrit :
>
>> It does not seem to work :
>> netperf -H 192.168.0.1 -l 10 -t UDP_STREAM
>> MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
>> 192.168.0.1 (192.168.0.1) port 0 AF_INET
>> Socket  Message  Elapsed      Messages
>> Size    Size     Time         Okay Errors   Throughput
>> bytes   bytes    secs            #      #   10^6bits/sec
>>
>> 106496   65507   10.01        1836      0       0.00
>> 419227124           0.00      536870912              0.00
>>
>
> Thats because netperf -t UDP_STREAM sends big UDP frames by default,
> that must be fragmented, and defragmented on destination. Maybe some
> frags are lost.
>
> Try :
>
> netperf -H 192.168.0.1 -l 10 -t UDP_STREAM -- -m 1500
>
>

/ # netperf -H 192.168.0.1 -c -l 10 -t UDP_STREAM -- -m 1500
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.0.1 (192.168.0.1) port 0 AF_INET
Socket  Message  Elapsed      Messages                   CPU      Service
Size    Size     Time         Okay Errors   Throughput   Util     Demand
bytes   bytes    secs            #      #   10^6bits/sec % SU     us/KB

106496    1500   10.00       54477      0        0.0     65.34    100.000
1073741824           2.25            0               0.0     65.34    -1.000

/ # netperf -H 192.168.0.1 -c -l 10 -t UDP_STREAM -- -m 1400
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.0.1 (192.168.0.1) port 0 AF_INET
Socket  Message  Elapsed      Messages                   CPU      Service
Size    Size     Time         Okay Errors   Throughput   Util     Demand
bytes   bytes    secs            #      #   10^6bits/sec % SU     us/KB

106496    1400   10.00       73591      0        0.0     82.38    100.000
-2147483648           2.25      1610612736               0.0     82.38    -1.000

I will recompile my kernel in order to use perf as well, in order to
get profiling in the TCP case...
JM
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