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From: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Ming Lei <tom.leiming-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "Ben Hutchings"
	<bhutchings-s/n/eUQHGBpZroRs9YW3xA@public.gmane.org>,
	"Oliver Neukum" <oliver-GvhC2dPhHPQdnm+yROfE0A@public.gmane.org>,
	"Grant Grundler"
	<grundler-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	"Freddy Xin" <freddy-knRN6Y/kmf1NUHwG+Fw1Kw@public.gmane.org>,
	"David Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"ASIX Louis [蘇威陸]"
	<louis-knRN6Y/kmf1NUHwG+Fw1Kw@public.gmane.org>,
	"Allan Chou" <allan-knRN6Y/kmf1NUHwG+Fw1Kw@public.gmane.org>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A
Date: Thu, 25 Jul 2013 08:11:28 -0700	[thread overview]
Message-ID: <1374765088.23313.21.camel@edumazet-glaptop> (raw)
In-Reply-To: <CACVXFVNre5SsJhaVqFNRcop7ahqxabWqHZkjBZccj1ZqOAUZ9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Thu, 2013-07-25 at 22:52 +0800, Ming Lei wrote:

> Maybe need to try it with TSO enabled, in my test on ax88179_178a NIC after
> applying your disabling TSO patch, tx throughput is less than 600Mbps, but rx
> is close to 900Mbps.

It looks like TCP stack could for this case allocate linear skbs
(GFP_KERNEL context), using order-3 pages, and not adding frags on them,
to avoid the skb_linearize() hazard (in GFP_ATOMIC)

In case of retransmits, skb are small (one MSS) so the skb_linearize()
should succeed most of the time.



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  parent reply	other threads:[~2013-07-25 15:11 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-20  9:16 freddy
2013-07-22 17:07 ` Eric Dumazet
2013-07-22 17:11   ` Ben Hutchings
2013-07-22 18:29   ` Grant Grundler
2013-07-22 18:38     ` Ben Hutchings
2013-07-22 18:47       ` Eric Dumazet
2013-07-22 19:47         ` Ben Hutchings
     [not found]           ` <1374522471.1635.48.camel-/LGg1Z1CJKQ+9kgCwbf1HqK4ta4zdZpAajtMo4Cw6ucAvxtiuMwx3w@public.gmane.org>
2013-07-23  6:10             ` Eric Dumazet
2013-07-23 23:46               ` David Miller
2013-07-23 23:56                 ` Eric Dumazet
2013-07-24  0:05                   ` Eric Dumazet
2013-07-24  0:15                     ` [PATCH] usbnet: do not pretend to support SG/TSO Eric Dumazet
2013-07-26 20:48                       ` David Miller
2013-07-24  0:17                     ` [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A David Miller
2013-07-24  2:29                 ` Grant Grundler
     [not found]                   ` <CANEJEGtLavwdPdq_Qojz_x-DQ3KXfZp0vPYr6imKtNxN0Hf_2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-24  2:32                     ` Grant Grundler
2013-07-25  2:28               ` Ming Lei
2013-07-25  5:10                 ` Eric Dumazet
2013-07-25  5:25                   ` Ming Lei
     [not found]                     ` <CACVXFVNyFk0Zpi4tC0ENiq8RcrtrjYW-Dhs+A56+Pw4BKm8y8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-25 11:01                       ` Eric Dumazet
2013-07-25 14:52                         ` Ming Lei
2013-07-25 15:00                           ` Ben Hutchings
     [not found]                           ` <CACVXFVNre5SsJhaVqFNRcop7ahqxabWqHZkjBZccj1ZqOAUZ9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-07-25 15:11                             ` Eric Dumazet [this message]
2013-07-25 13:34                     ` Ben Hutchings

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