linux-kernel - Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

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]

Date:	Tue, 7 Nov 2006 09:07:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Len Brown <lenb@...nel.org>
Cc:	Andreas Mohr <andi@...x01.fht-esslingen.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

* Len Brown <len.brown@...el.com> wrote:

> So given that C3 on every known system that has shipped to date breaks 
> the LAPIC timer (and apparently this applies to C2 on these AMD 
> boxes), dynticks needs a solid story for co-existing with C3.

check out 2.6.19-rc4-mm2: it detects this breakage and works it around 
by using the PIT as a clock-events source. That did the trick on my 
laptop which has this problem too. I agree with you that degrading the 
powersaving mode is not an option.

we've got a question about HPET: it seems all recent hardware has it, 
but the BIOS rarely mentions it, so the Linux driver does not enable 
HPET. Is there any chance to enable HPET (in the chipset?) - this would 
probably be a higher-quality clock-events source than the PIT.

	Ingo
-
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/