netdev - Re: [PATCH net-next 01/10] tcp: add tp->tcp

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Date:   Tue, 25 Apr 2017 14:33:30 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Yuchung Cheng <ycheng@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Soheil Hassas Yeganeh <soheil@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 01/10] tcp: add tp->tcp_mstamp field

On Tue, Apr 25, 2017 at 2:27 PM, Yuchung Cheng <ycheng@...gle.com> wrote:

>> +       struct skb_mstamp tcp_mstamp; /* most recent packet received/sent */

> Eric: would this new stamp cover outgoing packet as well in the
> future? in the patch series seem to cover only the incoming packets.

This is the plan yes : tp->lsndtime will also be replaced for a better
TSO autodefer.

When it happens, tp->tcp_mstamp will be updated once per write episode.

And we'll remove a lot of skb_mstamp_get(&skb->skb_mstamp) calls all
over the places.