:Increasing the interrupt moderation frequency worked on the re driver, :but it only made it marginally better. Even without moderation, :however, I could lose packets without m_defrag. I suspect that there is :something in the higher level layers that is causing the packet loss. I :have no explanation why m_defrag makes such a big difference for me, but :it does. I also have no idea why a 20Mbps UDP stream can lose data over :gigE phy and not lose anything over 100BT... without the above mentioned :changes that is. It kinda sounds like the receiver's UDP buffer is not large enough to handle the burst traffic. 100BT is a much slower transport and the receiver (userland process) was likely able drain its buffer before new packets arrived. Use netstat -s to observe the drop statistics for udp on both the sender and receiver sides. You may also be able to get some useful information looking at the ip stats on both sides too. Try bumping up net.inet.udp.recvspace and see if that helps. In anycase, you should be able to figure out where the drops are occuring by observing netstat -s output. -Matt Matthew Dillon <dillon_at_backplane.com>Received on Mon Nov 22 2004 - 23:14:21 UTC
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