[Winpcap-bugs] under high load, winpcap not working properly

[Gianluca Varenni]

Can you please send me the patches you applied to the driver and packet.dll?

Have a nice day
GV

----- Original Message ----- 
From: "David Baliko" <davidbaliko at hotmail.com>
To: <winpcap-bugs at winpcap.org>
Sent: Monday, June 11, 2007 2:01 PM
Subject: [Winpcap-bugs] under high load, winpcap not working properly


> hi all!
>
> i'm used to work on my low-level development and i needed an interface to 
> windows through ethernet, at this point comed the winpcap, unfortunetly 
> when i was done with my program and started to test the system, i 
> discovered that if i transfer at the maximum speed, the winpcap is unable 
> to capture my packets no mather what parameters i set, so i started to 
> look for the problem and found that if i want to access to the kernel 
> buffer efficiently, sure i need to use a big transfer buffer, but it 
> happen that if i set this high the kernel transfer take time, no mather 
> the actual winpcap kernel buffer level, i hope you see the nonsense here: 
> if i set the transfer buffer to small then i need to call the readfile fn 
> too often to avoid packet loss so this is not optimal even nor is not 
> working, and if i set the transfer buffer to big then it is not working 
> also because even an empty buffer reading is taking as many times as the 
> full buffer reading  :)
>
> so for me the solution was that i hacked a little the driver, now i have a 
> message (variable) that show me the actual kernel buffer level, so now i'm 
> reading as many bytes as exactly the level of the internal buffer, and 
> belive it or not, now everything is working like a charm
>
> so i think you sould consider to put something like this into the official 
> winpcap
>
> thanks for the attention
>
> david
>
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