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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: David Vrabel <david.vrabel@citrix.com>, xen-devel@lists.xenproject.org
Cc: Jan Beulich <jbeulich@suse.com>
Subject: Re: [PATCHv2] x86: only check for two watchdog NMIs
Date: Mon, 1 Feb 2016 17:33:26 +0000	[thread overview]
Message-ID: <56AF96E6.7020302@citrix.com> (raw)
In-Reply-To: <1454346592-27067-1-git-send-email-david.vrabel@citrix.com>

On 01/02/16 17:09, David Vrabel wrote:
> Since the NMI handler can now recognize watchdog NMIs, make
> check_nmi_watchdog() only check for at least two watchdog NMIs.  This
> prevents false negatives caused by other processors (which may be
> being power managed by the BIOS) running at reduced clock frequencies.
>
> We check for more than one NMI since there are apparently systems
> where the NMI works only once.
>
> This will also slightly speed up boot times since we only wait the
> full 10 ticks if the NMI watchdog on one or more CPUs is not working.
>
> Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

      reply	other threads:[~2016-02-01 17:34 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-01 17:09 [PATCHv2] x86: only check for two watchdog NMIs David Vrabel
2016-02-01 17:33 ` Andrew Cooper [this message]

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