Sorry, I wasn't clear that the queues are necessary for our configuration. The configuration is somewhat complex. I was only attempting to highlight the important parts. Robert Ross DSCI Inc. Office: 732.542.3113 x173 Home: 609.702.8114 Cell: 609.509.5139 Fax: 253.550.6198
________________________________ From: Beyers Cronje [mailto:[EMAIL PROTECTED] Sent: Friday, January 25, 2008 7:31 PM To: Robert Ross Cc: [EMAIL PROTECTED] Subject: Re: [Click] Userlevel performance issues Hi Robert, * We first found that when UserLevel Click started pulling from a PCAP file, the performance of the ToDevice() appeared to drop sharply. What I mean by this is that the ToDevice() pull handler reported values in the range of 200 packets/second once the PCAP file started reading. This resulted in the outbound queue just prior to the ToDevice() filling up and eventually overflowing because the packet rate in the PCAP file is far more than 200 packets/second. You dont have to use a queue between FromDump and ToDevice as FromDump is an agnostic element. In other words you can connect Todevice directly to FromDump which should ensure that at least no packets are dropped and you should see best ToDevice performance. Also there are a few tuning parameters. Try tuning your NIC TX Ring size. On the e1000 driver the default TX ring size is 256, experiment with different value to see if it makes a difference.ToDevice uses a packet socket from transmit, so it might be worth experimenting with /proc/sys/net/core/wmem_default /proc/sys/net/core/wmem_max Beyers _______________________________________________ click mailing list click@amsterdam.lcs.mit.edu https://amsterdam.lcs.mit.edu/mailman/listinfo/click
