linux-kernel - Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <4778382F.1030103@reed.com>
Date:	Sun, 30 Dec 2007 19:30:39 -0500
From:	"David P. Reed" <dpreed@...d.com>
To:	Richard Harman <richard@...hardharman.com>
CC:	Eduard-Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	pharon@...il.com, Rene Herman <rene.herman@...access.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] Option to disable AMD C1E (allows dynticks to work)



Richard Harman wrote:
>
>>> I think I may have a monkey wrench to throw into this, I finally got 
>>> around to testing the C1E patch, and the port80 patch.  End result: 
>>> port80 patch has zero effect on this laptop, and the C1E patch makes
>>> it stable.
>>>
>
Stating that your system is "stable" is not very definitive.   Does 
hwclock work when full Fedora 8 is running without the port80 patch, or 
have you disabled the uses of hwclock in your init and shutdown code?   
Have you set the hwclock setting to use the extremely dangerous 
"-directisa" option - which hides the problem because it avoids the port 
80 i/o?

Try compiling and running the test program port80.c a few times.   If 
your machine doesn't hang, it would be interesting to see the results it 
gives.

The C1E patch alone does not fix the port 80 problem several of us have 
observed.  what does dmidecode say for your motherboard vendor and model?


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/