netdev - Re: [PATCH net-next] tcp: tcp_transmit

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Message-ID: <1381540819.4971.117.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Fri, 11 Oct 2013 18:20:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, fitz@...yale.edu, ycheng@...gle.com,
	ncardwell@...gle.com
Subject: Re: [PATCH net-next] tcp: tcp_transmit_skb() optimizations

On Fri, 2013-10-11 at 15:43 -0700, Eric Dumazet wrote:
> On Fri, 2013-10-11 at 17:48 -0400, David Miller wrote:
> 
> > This patch is correct, so I've applied it, but it points out a bug.
> > 
> > The __tcp_retransmit_skb() code that does a __pskb_copy() to handle
> > NET_IP_ALIGN violations and skb_headroom() overflows is buggy because
> > it needs to store a congestion control timestamp in the original 'skb'
> > since that's what we'll look at in the retransmit queue.
> 
> Yes, I saw that, indeed.
> 
> I added it as low priority bug for the moment, as the default congestion
> module do not really care, and this case is really unlikely ;)
> 

Ah, I remember now that the conclusion was :
the timestamp is not taken into account for retransmits.

( FLAG_RETRANS_DATA_ACKED )


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