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

["yon ar c'hall" <yon.ar.chall () gmail com>]

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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