netdev - Re: Netperf UDP issue with connected sockets

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Date:   Mon, 28 Nov 2016 10:40:32 -0800
From:   Rick Jones <rick.jones2@....com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: Netperf UDP issue with connected sockets

On 11/28/2016 10:33 AM, Rick Jones wrote:
> On 11/17/2016 12:16 AM, Jesper Dangaard Brouer wrote:
>>> time to try IP_MTU_DISCOVER ;)
>>
>> To Rick, maybe you can find a good solution or option with Eric's hint,
>> to send appropriate sized UDP packets with Don't Fragment (DF).
>
> Jesper -
>
> Top of trunk has a change adding an omni, test-specific -f option which
> will set IP_MTU_DISCOVER:IP_PMTUDISC_DO on the data socket.  Is that
> sufficient to your needs?

Usage examples:

raj@...dy:~/netperf2_trunk/src$ ./netperf -t UDP_STREAM -l 1 -H 
raj-folio.americas.hpqcorp.net -- -m 1472 -f
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 
raj-folio.americas.hpqcorp.net () port 0 AF_INET
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992    1472   1.00        77495      0     912.35
212992           1.00        77495            912.35

[1]+  Done                    emacs nettest_omni.c
raj@...dy:~/netperf2_trunk/src$ ./netperf -t UDP_STREAM -l 1 -H 
raj-folio.americas.hpqcorp.net -- -m 14720 -f
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 
raj-folio.americas.hpqcorp.net () port 0 AF_INET
send_data: data send error: Message too long (errno 90)
netperf: send_omni: send_data failed: Message too long

happy benchmarking,

rick jones