Re: [PATCH net-next] tcp: prepare skbs for better sack shifting

2016-09-17 Thread David Miller
From: Eric Dumazet Date: Thu, 15 Sep 2016 09:33:02 -0700 > From: Eric Dumazet > > With large BDP TCP flows and lossy networks, it is very important > to keep a low number of skbs in the write queue. > > RACK and SACK processing can perform a linear scan of it. > > We should avoid putting any

Re: [PATCH net-next] tcp: prepare skbs for better sack shifting

2016-09-15 Thread Yuchung Cheng
On Thu, Sep 15, 2016 at 9:33 AM, Eric Dumazet wrote: > > From: Eric Dumazet > > With large BDP TCP flows and lossy networks, it is very important > to keep a low number of skbs in the write queue. > > RACK and SACK processing can perform a linear scan of it. > > We should avoid putting any payloa

[PATCH net-next] tcp: prepare skbs for better sack shifting

2016-09-15 Thread Eric Dumazet
From: Eric Dumazet With large BDP TCP flows and lossy networks, it is very important to keep a low number of skbs in the write queue. RACK and SACK processing can perform a linear scan of it. We should avoid putting any payload in skb->head, so that SACK shifting can be done if needed. With th