Hi,<br><br>We are running on 5.5 on a HP ProLiant DL360 G6.<br>Kernel version is 2.6.18-194.17.1.el5 (we had also tested with the latest available kernel kernel-2.6.18-238.1.1.el5.x86_64)<br><br>We running some performance tests using the "iperf" utility.<br>
<br>We are seeing very bad and inconsistent performance on the UDP testing.<br><br>The maximum we could get, was 440 Mbits/sec, and it varies from 250 to 440 Mbits/sec.<br>We are connected on a 1000Mb/s link, we also tested the same using a cross-over connections between the two machines, but the same performance.<br>
<br>We also see a lot of dropped UDP packets.<br><br>Udp:<br> 551522838 packets received<br> 1902 packets to unknown port received.<br> 109709802 packet receive errors<br> 7239 packets sent<br><br><br>We had checked all the kernel configurations and set them as recommended.<br>
<br>This is the settings and tests we have done <br><br>Server:<br> net.core.rmem_default = 2097152<br> net.core.wmem_default = 2097152<br> net.core.rmem_max = 8388608<br> net.core.wmem_max = 8388608<br> strace -fttt -o /tmp/server.trace iperf -s -u -p 2222 -w 6m -i 5 -l 1k<br>
<br>Client:<br> net.core.rmem_default = 2097152<br> net.core.wmem_default = 2097152<br> net.core.rmem_max = 8388608<br> net.core.wmem_max = 8388608<br> strace -fttt -o /tmp/client.trace iperf -p 2222 -u -w 6m -i 5 -t 60 -c 192.168.1.2 -b 990M -l 1k<br>
<br>Can someone please help me with this, since I am running in circles and can't get the required UDP performance?<br clear="all"><br>-- <br>Prasad Pillarisetti<br>"If everything is coming your way, then you are in the wrong lane" <br>