netdev - RE: Re: RTL 8169 linux driver question

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Date:	Wed, 28 Nov 2012 10:32:12 +0800
From:	hayeswang <hayeswang@...ltek.com>
To:	'Francois Romieu' <romieu@...zoreil.com>,
	'David Laight' <David.Laight@...LAB.COM>
CC:	'Stéphane ANCELOT' <sancelot@...e.fr>,
	<netdev@...r.kernel.org>, <sancelot@...alliance.com>,
	'nic_swsd' <nic_swsd@...ltek.com>
Subject: RE: Re: RTL 8169  linux driver question

Francois Romieu [mailto:romieu@...zoreil.com] 
[...]
> Something like the patch below against net-next could help once I will
> have tested it.
> 
> I completely guessed the Tx usec scale factor at gigabit 
> speed (125 us, 
> 100 us, disabled, who knows ?) and I have no idea which 
> specific chipsets
> it should work with.
> 
> Hayes, may I expect some hindsight regarding:
> 1 - the availability of the IntrMitigate (0xe2) register through the
>     8169, 8168 and 810x line of chipsets

8169, 8168, and 8136(810x) serial chipsets support it.

> 2 - the Tx timer unit at gigabit speed

The unit of the timer depneds on both the speed and the setting of CPlusCmd
(0xe0) bit 1 and bit 0.

For 8169
bit[1:0] \ speed	1000M		100M		10M
0 0		320ns		2.56us		40.96us
0 1		2.56us		20.48us		327.7us
1 0		5.12us		40.96us		655.4us
1 1		10.24us		81.92us		1.31ms

For the other
bit[1:0] \ speed	1000M		100M		10M
0 0		5us		2.56us		40.96us
0 1		40us		20.48us		327.7us
1 0		80us		40.96us		655.4us
1 1		160us		81.92us		1.31ms

 
Best Regards,
Hayes

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