Re: TCP=828mbps, UDP=1mbps? (both running 2.6.13.2)
From: Daniel J Blueman
Date: Wed Sep 28 2005 - 04:58:54 EST
Justin,
When running iperf in UDP mode (-u), you must specify a bandwidth, ie:
server$ iperf -s -u
client$ iperf -c server -u -b 1000M
Justin Piszcz wrote:
> Any idea why with TCP I get 828 megabits on my gigabit connection but only
> 1.05 megabits with UDP?
>
> Using iperf to benchmark.
>
> TCP
> ------------------------------------------------------------
> Server listening on TCP port 5001
> TCP window size: 85.3 KByte (default)
> ------------------------------------------------------------
> [ 4] local 192.168.1.12 port 5001 connected with 192.168.1.253 port
> 48853
> [ 4] 0.0-35.1 sec 3.38 GBytes 828 Mbits/sec
>
>
> UDP
> ------------------------------------------------------------
> Server listening on UDP port 5001
> Receiving 1470 byte datagrams
> UDP buffer size: 101 KByte (default)
> ------------------------------------------------------------
> [ 3] local 192.168.1.12 port 5001 connected with 192.168.1.253 port
> 32773
> [ 3] 0.0-10.0 sec 1.25 MBytes 1.05 Mbits/sec 0.043 ms 0/ 893 (0%)
>
>
> p34:~$ netstat -i
> Kernel Interface table
> Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
> Flg
> eth0 1500 0 1266337 0 0 0 2588651 0 0 0
> BMRU
> eth1 1500 0 2358 0 0 0 2229 0 0 0
> BMRU
> eth2 1500 0 39706 0 0 0 5747 0 0 0
> BMNRU
> lo 16436 0 184 0 0 0 184 0 0 0
> LRU
>
> box2:~$ netstat -i
> Kernel Interface table
> Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR
> Flg
> eth0 1500 0 2955176 0 0 0 3696501 0 0 0
> BMRU
> lo 16436 0 612 0 0 0 612 0 0 0
> LRU
___
Daniel J Blueman
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