Sorry, I think this is not a kernel related problem rather than problem in
UDP bandwidth:
[root@ABC iperf-2.0.5]# iperf -c XYZ
------------------------------------------------------------
Client connecting to ca-ostest193, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local 139.185.50.70 port 56604 connected with 139.185.48.193 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.10 GBytes 942 Mbits/sec
[root@ca-ostest286 iperf-2.0.5]#
[root@ca-ostest286 iperf-2.0.5]#
[root@ABC iperf-2.0.5]# iperf -c XYZ -u
------------------------------------------------------------
Client connecting to ca-ostest193, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 111 KByte (default)
------------------------------------------------------------
[ 3] local 139.185.50.70 port 55770 connected with 139.185.48.193 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 60.0 GBytes 51.5 Gbits/sec
[ 3] Sent 893 datagrams
read failed: Connection refused
[ 3] WARNING: did not receive ack of last datagram after 5 tries.
[root@ABC iperf-2.0.5]# ethtool eth3
Settings for eth3:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: g
Wake-on: d
Link detected: yes
On Tue, Apr 26, 2011 at 3:19 PM, er krishna <erkris...@gmail.com> wrote:
> Hi All,
>
> I am trying to use iperf on RHEL 6 and I am getting wrong result in UDP
> case. My network max spped is 1gbp/s , but with 2.6.32 kernel it is giving
> me 38 gbp/s. With 2.6.18 kernel I was getting ~800 mbp/s speed. Following
> command has run for client:
>
> [root@pvm61ext3 iperf-2.0.5]# iperf -c 139.185.51.53 -u -b 300M
> ------------------------------------------------------------
> Client connecting to 139.185.51.53, UDP port 5001
> Sending 1470 byte datagrams
> UDP buffer size: 256 KByte (default)
> ------------------------------------------------------------
> [ 3] local 139.185.48.101 port 6574 connected with 139.185.51.53 port 5001
> [ ID] Interval Transfer Bandwidth
> [ 3] 0.0-10.0 sec 44.4 GBytes 38.1 Gbits/sec
> [ 3] Sent 256383 datagrams
> read failed: Connection refused
> [ 3] WARNING: did not receive ack of last datagram after 2 tries.
>
>
> Following command has run for server:
>
> [root@pvm61ocfs iperf-2.0.5]# iperf -s -w 128k
>
>
> Can anybody please help me here to understand why it is happening. Is this
> a kernel bug or iperf bug ?
>
>
> Krishna
>
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