linux-kernel - Re: Linux 2.6.21-rc1

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: <1172085792.25076.119.camel@localhost.localdomain>
Date:	Wed, 21 Feb 2007 20:23:12 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...e.hu
Subject: Re: Linux 2.6.21-rc1

On Wed, 2007-02-21 at 10:23 -0800, Daniel Walker wrote:
> Right, but eventually there isn't a regular timer interrupt through the
> io-apic. I don't think in the past IRQ0 stops without the system
> crashing, so check_timer() could assume the timer (IRQ0) is _always_
> regular.
> 
> do you know what the requirement are for routing the NMI through the
> io-apic? 

Sorry. I checked. switching PIT off really breaks nmi_watchdog=1, as
this just mirrors IRQ#0 to the NMI. No IRQ#0 from PIT, no NMI

We could keep PIT running with an empty interrupt handler when
nmi_watchdog=1 is set, but this interferes nicely with broadcasting.

Does nmi_watchdog=2 work ? We might switch to that, when a local APIC is
available. 

	tglx



-
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/