[Winpcap-users] Winpcap-users Digest, Vol 66, Issue 11

[Gianluca Varenni]

--------------------------------------------------
From: "Vikram Narayanan" <vikram186 at gmail.com>
Sent: Thursday, September 16, 2010 1:17 AM
To: <winpcap-users at winpcap.org>
Subject: Re: [Winpcap-users] Winpcap-users Digest, Vol 66, Issue 11

> Thanks for your reply. At least can I get information about the
> receive latency of the PacketCE version or possible ways of measuring
> it. I want to compute the time difference between the packet received
> in the wire and the packet given to an application from PacketCE.
>

I don't have an answer for that. You will probably need to modify the driver 
of the NIC card to add some timestamp somewhere in the packet. Having said 
that, you need to consider that the NIC cards do not notify the OS 
immediately when a packet is received. In order to reduce the number of 
interrupts, they "batch" the packets and generate an interrupt (thus 
notifying the OS) only after a certain amount of time of packets has elapsed 
(usually in the order of some microseconds). This is what's usually called 
interrupt coalescing.

Hope it helps
GV



> Regards
> Vikram N
>> Hi all,
>>
>> I have downloaded the packetCE.zip for windows CE and trying to make it 
>> work with Windows CE 6.0.
>> I want to know, what version of winpcap is ported to Windows CE 3.0 (I 
>> mean the source version)
>>
>> That CE port was developed more than 5 years ago by some WinPcap 
>> contributor (not by the WinPcap team itself). Unfortunately I don't know 
>> which version was used as a reference. Consider that  more of a port, 
>> it's a complete rewrite of the driver and packet.dll for WinCE.
>> Also
>> - wpcap.dll was not ported to CE
>> - packet.dll on CE does not support more than one open per adapter.
>>
>> And also, how will be the performance of the driver, if i use PacketCE in 
>> my windows CE device?
>> If I want to move the packetCE to the latest version of winpcap where 
>> should I start and how tough it is to make it work with the latest 
>> version?
>>
>> I'm not familiar with CE so I don't know exactly how it would take. 
>> Consider that the driver model on CE is different from Windows NTx. In 
>> general in order to port that version of WinPcap to the latest version of 
>> CE and WinPcap probably requires a lot of kernel work --> you need to 
>> have some good knowledge of the CE kernel and networking stack.
>>
>> Have a nice day
>> GV
>>
>> --
>> Regards
>> Vikram
> _______________________________________________
> Winpcap-users mailing list
> Winpcap-users at winpcap.org
> https://www.winpcap.org/mailman/listinfo/winpcap-users