netdev - Re: [PATCH net-next] net: skb_segment() should preserve backpressure

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Message-Id: <20141029.144736.1849092497823226235.davem@davemloft.net>
Date:	Wed, 29 Oct 2014 14:47:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	makita.toshiaki@....ntt.co.jp, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH net-next] net: skb_segment() should preserve
 backpressure

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 27 Oct 2014 10:30:51 -0700

> From: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> 
> This patch generalizes commit d6a4a1041176 ("tcp: GSO should be TSQ
> friendly") to protocols using skb_set_owner_w()
> 
> TCP uses its own destructor (tcp_wfree) and needs a more complex scheme
> as explained in commit 6ff50cd55545 ("tcp: gso: do not generate out of
> order packets")
> 
> This allows UDP sockets using UFO to get proper backpressure,
> thus avoiding qdisc drops and excessive cpu usage.
> 
> Here are performance test results (macvlan on vlan):
 ...
> [edumazet] Rewrote patch and changelog.
> 
> Signed-off-by: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks everyone.
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