linux-kernel - RE: [E1000-devel] e1000e interface hang on 82574L

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Date:	Mon, 19 Mar 2012 16:29:03 +0000
From:	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>
To:	Nix <nix@...eri.org.uk>
CC:	Chris Boot <bootc@...tc.net>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: RE: [E1000-devel] e1000e interface hang on 82574L

>-----Original Message-----
>From: Nix [mailto:nix@...eri.org.uk]
>Sent: Monday, March 19, 2012 9:20 AM
>To: Wyborny, Carolyn
>Cc: Chris Boot; e1000-devel@...ts.sourceforge.net; netdev; lkml
>Subject: Re: [E1000-devel] e1000e interface hang on 82574L
>
[...]

>you'll see that I tested that, and it doesn't work :( even if it did
>work, it shouldn't be needed: the driver attempts to turn off PCIe ASPM
>on affected NICs, and fails, apparently because *something* turns it
>back on again.
>
>--
>NULL && (void)

The driver attempts to disable L0s state, not the entire feature.  It is also required that the device upstream on the bus from the 82574L have this disabled.  Yes, I agree there appears to be something in the os that either ren-enables or fails to disable the feature on the upstream device, as desired.  Platforms/systems also appear to vary in this regard, so the solutions may vary a bit as well.  

Its worth trying your solution as well if what I suggested doesn't work, but there is not one solution that fits all, unfortunately.

Thanks,

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation

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