netdev - Re: [PATCH] net: skb_fclone_busy() needs to detect orphaned skb

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Date:	Thu, 30 Oct 2014 19:59:47 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, ncardwell@...gle.com
Subject: Re: [PATCH] net: skb_fclone_busy() needs to detect orphaned skb

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 30 Oct 2014 10:32:34 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Some drivers are unable to perform TX completions in a bound time.
> They instead call skb_orphan()
> 
> Problem is skb_fclone_busy() has to detect this case, otherwise
> we block TCP retransmits and can freeze unlucky tcp sessions on
> mostly idle hosts.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Fixes: 1f3279ae0c13 ("tcp: avoid retransmits of TCP packets hanging in host queues")

Applied, and queued up for -stable, thanks Eric.

>  This problem is known to hurt users of linux-3.16 kernels used by guests kernels.
>  David, I can provide backports if you want.

Since 3.16 is no longer active, I'll only need to put this into 3.17-stable
which I should be able to handle on my own.

But thanks for offering, sometimes difficult backports take up a lot
of time.
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