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Message-ID: <1374765088.23313.21.camel@edumazet-glaptop>
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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