netdev - Re: TCP communication for raw image transmission

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Date:	Mon, 2 Jan 2012 19:00:31 +0100
From:	Jean-Michel Hautbois <jhautbois@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: TCP communication for raw image transmission

2012/1/2 Eric Dumazet <eric.dumazet@...il.com>:
> Le lundi 02 janvier 2012 à 18:20 +0100, Jean-Michel Hautbois a écrit :
>
>> Here we go...
>>
>> Recv   Send    Send
>> Socket Socket  Message  Elapsed
>> Size   Size    Size     Time     Throughput
>> bytes  bytes   bytes    secs.    10^6bits/sec
>>
>>  87380  16384  16384    60.01      21.79
>>
>> It is not very good, AFAIK.
>> CPU usage is between 17 and 35%.
>
> Ouch...
>
> Better find out what is happening before even starting coding
> anything...
>
> checkout "netstat -s" on both sender/receiver

OK, here are the results :
netserver is launched on the x86 side and the ARM and x86 are
connected through ethernet network via a switch. There is nobody on
this network.

On ARM side :
netperf -H 192.168.1.10 -l 60 -t TCP_STREAM
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.1.10 (192.168.1.10) port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    60.02      22.01
/ # netstat -s
Ip:
    67326 total packets received
    4 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    67322 incoming packets delivered
    133712 requests sent out
Icmp:
    0 ICMP messages received
    0 input ICMP message failed.
    ICMP input histogram:
    0 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
Tcp:
    4 active connections openings
    0 passive connection openings
    0 failed connection attempts
    0 connection resets received
    0 connections established
    67167 segments received
    133712 segments send out
    0 segments retransmited
    0 bad segments received.
    0 resets sent
Udp:
    0 packets received
    0 packets to unknown port received.
    0 packet receive errors
    0 packets sent
    0 receive buffer errors
    0 send buffer errors
UdpLite:
TcpExt:
    2 TCP sockets finished time wait in fast timer
    2 delayed acks sent
    18 packets directly queued to recvmsg prequeue.
    3 packet headers predicted
    127 acknowledgments not containing data payload received
    67026 predicted acknowledgments
IpExt:
    InBcastPkts: 155
    InOctets: 3511540
    OutOctets: 199739352
    InBcastOctets: 16072

On the x86 side :
netperf -H 192.168.1.10 -l 60 -t TCP_STREAM
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
192.168.1.10 (192.168.1.10) port 0 AF_INET
Recv   Send    Send
Socket Socket  Message  Elapsed
Size   Size    Size     Time     Throughput
bytes  bytes   bytes    secs.    10^6bits/sec

 87380  16384  16384    60.02      22.01
/ # netstat -s
Ip:
    67326 total packets received
    4 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    67322 incoming packets delivered
    133712 requests sent out
Icmp:
    0 ICMP messages received
    0 input ICMP message failed.
    ICMP input histogram:
    0 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
Tcp:
    4 active connections openings
    0 passive connection openings
    0 failed connection attempts
    0 connection resets received
    0 connections established
    67167 segments received
    133712 segments send out
    0 segments retransmited
    0 bad segments received.
    0 resets sent
Udp:
    0 packets received
    0 packets to unknown port received.
    0 packet receive errors
    0 packets sent
    0 receive buffer errors
    0 send buffer errors
UdpLite:
TcpExt:
    2 TCP sockets finished time wait in fast timer
    2 delayed acks sent
    18 packets directly queued to recvmsg prequeue.
    3 packet headers predicted
    127 acknowledgments not containing data payload received
    67026 predicted acknowledgments
IpExt:
    InBcastPkts: 155
    InOctets: 3511540
    OutOctets: 199739352
    InBcastOctets: 16072


JM
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