linux-kernel - Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179

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Date:	Thu, 25 Jul 2013 08:11:28 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Oliver Neukum <oliver@...kum.org>,
	Grant Grundler <grundler@...gle.com>,
	Freddy Xin <freddy@...x.com.tw>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, linux-usb@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	ASIX Louis [蘇威陸] 
	<louis@...x.com.tw>, Allan Chou <allan@...x.com.tw>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A

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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