Re: [RFC PATCH 0/2]: hw timestamp support

["Mcmillan, Scott A" <scott.a.mcmillan () intel com>]

Yon,

I assume you're asking about commodity NICs, not something like Endace.  

The NIC I'm most familiar with that supports general hw timestamping is the Intel 82580 Gigabit Ethernet Controller.  
It can timestamp all RX packets in hardware, but only PTP TX packets.  

Scott

-----Original Message-----
From: tcpdump-workers-owner () lists tcpdump org [mailto:tcpdump-workers-owner () lists tcpdump org] On Behalf Of yon 
ar c'hall
Sent: Tuesday, May 25, 2010 4:41 AM
To: tcpdump-workers () lists tcpdump org
Subject: Re: [tcpdump-workers] [RFC PATCH 0/2]: hw timestamp support

Hello Scott,

By the way, do you know which NICs/network controllers support HW
timestamping for all packets (not only the PTP datagrams -- IEEE 1588) ?

Yon

On Mon, May 24, 2010 at 4:26 PM, Mcmillan, Scott A <
scott.a.mcmillan () intel com> wrote:

> [My apologies if this double posts.  The mail server didn't care for the
> first submission.]
>
> This patch adds the capability to select the packet timestamp source.  It
> also adds support for the PACKET_TIMESTAMP Linux kernel setting to specify
> the source of packet timestamps.  The corresponding Linux kernel patch is
> being submitted concurrently.
>
> A new command line option was added to tcpdump, -j, to specify the source
> of the packet timestamp.  Valid options are 'raw' to use the raw NIC HW
> timestamp and 'nic' to use the NIC HW timestamp transformed into the system
> clock basis.  If the option is not specified, or OS or the NIC do not
> support HW timestamping, a software timestamp is used (identical to the
> current behavior.)
>
> [Note: As a RFC, I'm posting this to the mailing list before submitting the
> patches to SourceForge.]
>
> Thanks,
> Scott
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