netdev - Re: [PATCH v3 net-next] tcp: refine TSO autosizing

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Date:	Sun, 07 Dec 2014 22:32:05 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>
Subject: Re: [PATCH v3 net-next] tcp: refine TSO autosizing

On Sun, 2014-12-07 at 13:24 -0800, Yuchung Cheng wrote:
> >                  */
> > -               limit = max_t(unsigned int, sysctl_tcp_limit_output_bytes,
> > -                             sk->sk_pacing_rate >> 10);
> > +               limit = max(2 * skb->truesize, sk->sk_pacing_rate >> 10);
> is this capping necessary if skb->truesize already takes the pacing
> rate into account from the new logic above?


This is needed for flows not using GSO/TSO : For such flows,
skb->truesize is a constant (2048 + sizeof(struct sk_buff))



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