netdev - Re: [PATCH net-next] tcp: guarantee forward progress in tcp

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Message-Id: <20160503.162054.1321812964438781830.davem@davemloft.net>
Date:	Tue, 03 May 2016 16:20:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	edumazet@...gle.com, netdev@...r.kernel.org, soheil@...gle.com,
	ast@...com, marcelo.leitner@...il.com
Subject: Re: [PATCH net-next] tcp: guarantee forward progress in
 tcp_sendmsg()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 02 May 2016 21:49:25 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Under high rx pressure, it is possible tcp_sendmsg() never has a
> chance to allocate an skb and loop forever as sk_flush_backlog()
> would always return true.
> 
> Fix this by calling sk_flush_backlog() only if one skb had been
> allocated and filled before last backlog check.
> 
> Fixes: d41a69f1d390 ("tcp: make tcp_sendmsg() aware of socket backlog")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.