[Winpcap-users] Broadcom Netxtreme & Timestamps

[Keith French]

The reason why I asked this question, is that there seems to be inaccuracies 
in timestamps on a trace captured with Ethereal V0.10.14 and WinPcap V3.1, 
where they can be out by several seconds sometimes.

Apparently if the NIC card does not do the time stamping itself, it may pass 
multiple packets in one go to WinPcap. I assume this would cause WinPcap to 
put the time stamp on at that point, which may well be different to the time 
the NIC received them?

Keith French.

----- Original Message ----- 
From: "Loris Degioanni" <loris.degioanni at gmail.com>
To: <winpcap-users at winpcap.org>
Sent: Friday, March 31, 2006 12:16 AM
Subject: Re: [Winpcap-users] Broadcom Netxtreme & Timestamps


> Even if it's possible to configure the Netxtreme card to do the 
> timestamping of packets, the current WinPcap driver will not take 
> advantage of it, since it always uses the PC clock to timestamp the 
> packets.
> It will surely be interesting, however, to know if the card has this 
> feature and how to enable it: maybe we can implement the support in a 
> future version of winpcap.
>
> Loris
>
>
> Keith French wrote:
>> Does anyone know if there is a way to force the Broadcom Netxtreme 57xx 
>> Gigabit NIC card to do the timestamping of packets, rather than just 
>> passing them to WinPcap to timestamp them. I know with displaying VLAN 
>> tags this can be done via a registry hack, I was just wondering if there 
>> might be one for the timestamps?
>>
>> Sorry for the repeat email, but for some reason the content of it did not 
>> appear on the website.
>>
>> Keith French.
>>
>>
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