netdev - RE: r8168 is needed to enter P-state: Package State 6 (pc6)onHaswell hardware

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Date:	Mon, 6 Oct 2014 03:06:07 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	Francois Romieu <romieu@...zoreil.com>,
	Ceriel Jacobs <linux-ide@...shplan.pro>
CC:	nic_swsd <nic_swsd@...ltek.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: r8168 is needed to enter P-state: Package State 6 (pc6)onHaswell hardware

 Francois Romieu [mailto:romieu@...zoreil.com] 
> Sent: Monday, October 06, 2014 12:59 AM
[...]
> > With in-kernel r8169 module, only P-state package C3 (pc3) 
> > can be reached
> > when enabling ASPM.
> > 
> > Only after installing r8168 driver (and enabling ASPM), a 
> > Haswell Celeron
> > G1820/G1840 processer will enter package C6 state (pc6).
> 
> Vanilla kernel r8169 driver logs a message that contains an 
> "XID" string.
> Please grep for it in your dmesg so that I can narrow the search for 
> meaningful differences in Realtek's r8168 driver.

I don't sure if the following information is helpful. Besides, I remember the rtl_init_one()
would disable it.

http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=d64ec841517a25f6d468bde9f67e5b4cffdc67c7

http://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=4521e1a94279ce610d3f9b7945c17d581f804242
 
Best Regards,
Hayes
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