[Winpcap-users] Timing problems

[Cyril Dupuit]

Hello GV and thank you for your response.

Now, I know that the problem is due to the OS and no to Winpcap.

Sorry for this "strange" question...

Cyril

----- Original Message ----- 
From: "Gianluca Varenni" <gianluca.varenni at cacetech.com>
To: <winpcap-users at winpcap.org>
Sent: Saturday, February 09, 2008 12:33 AM
Subject: Re: [Winpcap-users] Timing problems


>
> ----- Original Message ----- 
> From: "Cyril Dupuit" <cyrildupuit at hotmail.com>
> To: <winpcap-users at winpcap.org>
> Sent: Wednesday, February 06, 2008 12:05 PM
> Subject: [Winpcap-users] Timing problems
>
>
>> Hello,
>> I am developping an application under XP using winpcap to measure time 
>> stamping between packets.
>> It works fine but it is not very precise.
>> The cpu load modify the real packet timings.
>> There is a way to have a better timing efficiency with an option of 
>> winpcap or it is impossible ?
>
> It depends on how precise you want your timestamps. Please remember that 
> packets are timestamped when they reach the winpcap protocol driver, so 
> after the network card has notified the OS about them, and after the 
> network card driver has notified the upper layers (among which winpcap).
> WinPcap does its best to timestamp packets as soon as possible, what 
> happens during high cpu load is that probably the network card (among 
> other things) batches the delivery of packets to the OS, thus introducing 
> a jitter in the timestamping.
>
> Hope it helps
> GV
>
>
>>
>> Thank you in advance,
>> Cyril
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>
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