netdev - Re: [PATCH] net: use hardware buffer pool to allocate skb

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Message-ID: <1413591960.27176.26.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 17 Oct 2014 17:26:00 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...hat.com>
Cc:	David Laight <David.Laight@...LAB.COM>,
	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>,
	David Miller <davem@...emloft.net>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"LeoLi@...escale.com" <LeoLi@...escale.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] net: use hardware buffer pool to allocate skb

On Fri, 2014-10-17 at 11:53 -0700, Eric Dumazet wrote:

> Don't worry, I will work on it.

A very simple head drop strategy instead of tail drop on the socket
backlog seems to do the trick :

TCP behaves way better when there are head drops, as fast retransmits
can usually close the gap without any added delay. Sender automatically
adjusts its cwnd (or rate) according to the receiver skb->truesize /
skb->len ratio





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