netdev - Re: [net-2.6 PATCH] e1000e: enable/disable ASPM L0s and L1 and ERT according to hardware errata

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100427134335.GA2218@srcf.ucam.org>
Date:	Tue, 27 Apr 2010 14:43:35 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, gospo@...hat.com,
	Bruce Allan <bruce.w.allan@...el.com>
Subject: Re: [net-2.6 PATCH] e1000e: enable/disable ASPM L0s and L1 and ERT
	according to hardware errata

On Tue, Apr 27, 2010 at 06:33:04AM -0700, Jeff Kirsher wrote:
> From: Bruce Allan <bruce.w.allan@...el.com>
> 
> Prompted by a previous patch submitted by Matthew Garret <mjg@...hat.com>,
> further digging into errata documentation reveals the current enabling or
> disabling of ASPM L0s and L1 states for certain parts supported by this
> driver are incorrect.  82571 and 82572 should always disable L1.  For
> standard frames, 82573/82574/82583 can enable L1 but L0s must be disabled,
> and for jumbo frames 82573/82574 must disable L1.  This allows for some
> parts to enable L1 in certain configurations leading to better power
> savings.
> 
> Also according to the same errata, Early Receive (ERT) should be disabled
> on 82573 when using jumbo frames.

Looks good. Thanks for digging into this!

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html