I see delays in your 10mbit_130byte file Doing this:\windump -n -ttt -q -r 10mbit_130byte.pcap | cut -f1 -d" " >ttt10.csv And plotting the results shows a very spikey plot. Varies from almost 0 to 300+ microseconds. Average is about 150 microseconds but there are regular excursions to over 200 microseconds. So you're already seeing delays at 10mbit -- you just never fill up the buffers. Doing the same plot for 100mbit_130byte shows a first spike to 339us at packet 10143. There's your "10,000 packets runs OK". Your 100mbit_640byte first spikes at packet#6733. Bigger packets, earlier slowdown. Then this file shows the average packet delay jumps from 156 to 171 at packet#7142 or so. Then you have regular excursions down to almost 0 for the remaining time and a few excursions to 300+. The 100mbit_60byte is interesting. 50us average through packet 1371 with lots of 0-excursions. Then the average drops to 38us with fewer excursions to 0, then jumps to a dual-mode 150/160 us delay with regular 0-excursions. Michael D. Black Senior Scientist Advanced Analytics Directorate Northrop Grumman Information Systems
________________________________ From: [email protected] on behalf of Alimjan Kuramshin Sent: Thu 9/23/2010 10:26 AM To: [email protected] Subject: EXTERNAL:Re: [Winpcap-users] WinPCAP packets capture delay.. Hello, David! Thanks for Your test and attention. Okay, I have done some of my own testing with 10,000 packets I am not seeing any delay at all. Without 100,000 packets however, I am seeing some periodic delays. HOWEVER... My test is not good. It is not the same test as yours. I do not have an oscilloscope so I cannot know if the packets are being SENT without delay. I suspect they are. I suspect the delay I am seeing with my test is from the SENDING machine, not on the receiving/capturing machine. So my test in inconclusive. It proves nothing. Alimjan, are you absolutely certain there is no delay sending? Does your oscilloscope have a "record" feature? Can you review your oscilloscope recording to verify there are zero delays? It is important! In other words, do you have ABSOLUTE *PROOF* that the packets are being SENT without delay? I've done some test, and here is the results http://www.filefactory.com/file/b39ec4g/n/alimjan_kuramshin_winpcap_test.zip Can You look at them? May be You can find some thing. Thank You a lot. You are so kind! Bye..
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