From: Keir Fraser <keir.xen@gmail.com>
To: Jan Beulich <JBeulich@suse.com>,
Sander Eikelenboom <linux@eikelenboom.it>,
George Dunlap <George.Dunlap@eu.citrix.com>
Cc: wei.wang2@amd.com, Santosh Jodh <santosh.jodh@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: Using debug-key 'o: Dump IOMMU p2m table, locks up machine
Date: Tue, 04 Sep 2012 07:59:36 +0100 [thread overview]
Message-ID: <CC6B6568.3DAAD%keir.xen@gmail.com> (raw)
In-Reply-To: <5045BD5C02000078000985A7@nat28.tlf.novell.com>
On 04/09/2012 07:35, "Jan Beulich" <JBeulich@suse.com> wrote:
>>>> On 02.09.12 at 09:42, Keir Fraser <keir.xen@gmail.com> wrote:
>> On 31/08/2012 22:45, "Sander Eikelenboom" <linux@eikelenboom.it> wrote:
>>> - When using serial console: I get a infinite stream of "gfn: mfn: " lines,
>>> mean while on the normal console, S-ATA devices are starting to give errors.
>>
>> In this case the handler must be running in tasklet context. Not sure why
>> SATA interrupts would be affected as hardirq and softirq work will still be
>> carried out during execution of the keyhandler (the handler voluntarily
>> preempts itself for softirq work).
>>
>> Would need more investigation. :)
>
> Isn't that because tasklets (i.e. idle vCPU-s with tasklets active)
> get preferred in the schedulers? Some compensation might be
> needed for the penalized vCPU, at least if that one is pinned
> (not sure whether load balancing would be able to steal the
> head of the run queue from a remote CPU). Sander - are you
> by chance pinning Dom0 vCPU-s? And how many of them does
> your Dom0 have?
Jan, Yes you could be right, if Sander is pinning CPUs. Anyway, I wasn't
going to expend too much brain power on this situation. The case of spending
a few minutes in one key handler is not one I think is particularly sane.
-- Keir
> Jan
>
next prev parent reply other threads:[~2012-09-04 6:59 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-31 21:45 Using debug-key 'o: Dump IOMMU p2m table, locks up machine Sander Eikelenboom
2012-08-31 22:24 ` Santosh Jodh
2012-08-31 22:42 ` Sander Eikelenboom
2012-08-31 22:57 ` Santosh Jodh
2012-08-31 23:16 ` Sander Eikelenboom
2012-08-31 23:58 ` Santosh Jodh
2012-09-01 0:42 ` Santosh Jodh
2012-09-03 8:14 ` Jan Beulich
2012-09-01 2:01 ` Keir Fraser
2012-09-01 17:03 ` Santosh Jodh
2012-09-01 19:13 ` Keir Fraser
2012-09-02 2:08 ` Santosh Jodh
2012-09-02 7:13 ` Keir Fraser
2012-09-02 7:19 ` Keir Fraser
2012-09-02 8:43 ` Sander Eikelenboom
2012-09-02 14:58 ` Keir Fraser
2012-09-02 15:14 ` Sander Eikelenboom
2012-09-03 15:20 ` Wei Wang
2012-09-04 8:21 ` Sander Eikelenboom
2012-09-04 16:43 ` Sander Eikelenboom
2012-09-05 10:14 ` Jan Beulich
2012-09-05 10:25 ` Sander Eikelenboom
2012-09-05 10:40 ` Jan Beulich
2012-09-05 10:48 ` Sander Eikelenboom
2012-09-05 11:41 ` Jan Beulich
2012-09-05 12:11 ` Sander Eikelenboom
2012-09-05 14:15 ` Wei Wang
2012-09-05 15:05 ` Jan Beulich
2012-09-05 12:48 ` Wei Wang
2012-09-05 12:30 ` Wei Wang
2012-09-03 8:21 ` Jan Beulich
2012-09-03 8:33 ` Sander Eikelenboom
2012-09-03 9:05 ` Jan Beulich
2012-09-04 7:08 ` Sander Eikelenboom
2012-09-04 7:46 ` Jan Beulich
2012-09-04 8:13 ` Sander Eikelenboom
2012-09-04 9:26 ` Jan Beulich
2012-10-02 20:09 ` Konrad Rzeszutek Wilk
2012-10-03 13:12 ` Jan Beulich
2012-10-02 20:54 ` Matt Wilson
2012-09-20 8:08 ` Jan Beulich
2012-09-28 14:08 ` Sander Eikelenboom
2012-09-28 21:26 ` Jeremy Fitzhardinge
2012-10-02 20:08 ` Konrad Rzeszutek Wilk
2012-09-02 7:42 ` Keir Fraser
2012-09-04 6:35 ` Jan Beulich
2012-09-04 6:52 ` Sander Eikelenboom
2012-09-04 7:01 ` Keir Fraser
2012-09-04 6:59 ` Keir Fraser [this message]
2012-09-04 7:55 ` Jan Beulich
2012-09-04 8:04 ` Keir Fraser
2012-09-04 8:11 ` Keir Fraser
2012-09-04 8:20 ` Sander Eikelenboom
2012-09-04 8:38 ` Jan Beulich
2012-09-04 8:54 ` Keir Fraser
2012-09-04 9:40 ` Jan Beulich
2012-09-04 13:29 ` Andrew Cooper
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