netdev - RE: Throughput regression with `tcp: refine TSO autosizing`

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Date:	Fri, 6 Feb 2015 14:31:10 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Eric Dumazet' <eric.dumazet@...il.com>,
	Michal Kazior <michal.kazior@...to.com>
CC:	Neal Cardwell <ncardwell@...gle.com>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	"eyalpe@....mellanox.co.il" <eyalpe@....mellanox.co.il>
Subject: RE: Throughput regression with `tcp: refine TSO autosizing`

From: Eric Dumazet
> On Fri, 2015-02-06 at 05:53 -0800, Eric Dumazet wrote:
> 
> 
> > wifi could eventually do that, providing in skb->tx_completion_delay_us
> > the time spent in wifi driver.
> >
> > This way, we would have no penalty for network devices doing normal skb
> > orphaning (loopback interface, ethernet, ...)
> 
> Another way would be that wifi does an automatic orphaning after 1 or
> 2ms.

Couldn't you do byte counting?
So orphan enough packets to keep a few ms of tx traffic (at the current
tx rate) orphaned.
You might need to give the hardware both orphaned and non-orphaned (parented?)
packets and orphan some when you get a tx complete for an orphaned packet.

	David