netdev - Re: net-timestamp: MSG_TSTAMP flags and bytestream support

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Message-ID: <20140625073215.GB5566@localhost.localdomain>
Date:	Wed, 25 Jun 2014 09:32:15 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Willem de Bruijn <willemb@...gle.com>
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com, davem@...emloft.net
Subject: Re: net-timestamp: MSG_TSTAMP flags and bytestream support

On Tue, Jun 24, 2014 at 11:43:45AM -0400, Willem de Bruijn wrote:
> This patchset extends socket timestamping in a number of related ways.
> Most notably:
> 
> 2 MSG_TSTAMP: request a single tx timestamp by passing a flag on send
> 6 MSG_TSTAMP_ENQ: request a tx timestamp before traffic shaping.
> 5 MSG_TSTAMP_ACK: request a tx timestamp after acknowledgements (TCP)
> 4 TCP support for all three flags

Can you tell us a bit about the use case?  It sounds like that this is
for performance monitoring.

> Each individual patch commit message gives more detail about the
> specific feature.
> 
> The other patches support the main feature:
> 1 explicitly define the timestamp response API
> 3 optionally avoid looping large packets onto the socket error queue.
> 7 documentation and an example test.

I think #2 and #3 could be improvements to the so_timestamping api.

The others probably need their own, separate api. I can't imagine
wanting to mix so_timestamping with these new tcp time stamps, but
maybe you want to explain the expected scenario?

Thanks,
Richard
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