[Winpcap-users] Packets capture latency

[Alimjan Kuramshin]

Hello, Gianluca!

Thank you, for your attention and reply.

Well, and within Wireshark too (but this is not quite correct place for that).

When i receive one packet from my device i'm emmideatly send back received packet back(for testing)
and using oscilloscope watch for my laptop ethernet card TX+ and TX- pins. 

Also, i've tried to use different handles(pcap_open) for capturing/sening data, no changes the same result. :(

17.03.2010, в 20:06, Gianluca Varenni написал(а):

> What is the original delay between the packets?
> 
> Are you looking at the timestamps with wireshark?
> 
> Have a nice day
> GV
> 
> --------------------------------------------------
> From: "Alimjan Kuramshin" <alimjankuramshin at gmail.com>
> Sent: Wednesday, March 17, 2010 9:58 AM
> To: <winpcap-users at winpcap.org>
> Subject: [Winpcap-users] Packets capture latency
> 
>> Hello, everyone! My name is Alimjan and i'm developing custom board with 
>> the ethernet device and i've got some problem
>> with capturing data from it ..
>> 
>> I'm using Notebook Asus G1S with Windows XP + SP3 installed to connect to 
>> my board. Using WinPcap(4.1.1), i'm capture data from the board. So, i've 
>> found that delay between the captured packets is a very 'vary' i mean that 
>> it has huge spread, e.g,
>> at 10 mbits/s i've got 45-70 us delay, it is normal i gues, but some times 
>> this delay grow up to 3-7 ms (milliseconds), for example, distance between 
>> packets: 45 us, 46 us, 50 us, 47 us and so on.. then
>> 4 ms, 7 ms, 1 ms, and then again 53 us, 47 us and so on, the repeat... 
>> Number of 'normal' delay is also very 'vary', delay may appear in a 
>> different numbers of received packets, no logic :(
>> 
>> My laptop is directly connected to my board e.g. cross TX->RX, RX->TX, no 
>> hubs or something. Also using oscilloscope connected to the  TX+ and TX- 
>> lines i've found that it is no delay between packet that my custom board 
>> (device) have send.  Anybody please, help me to solve this situation,
>> may be i'm doing something wrong?
>> 
>> P.S. i'm using winpcap exapmle code to capture the packets with callback 
>> method and within pcap_next_ex.
>> 
>> P.P.S i'm sorry for my english spelling skill, i hope that you can 
>> understand my.
>> 
>> Many thanks, bye..
>> 
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> 
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