From: Keir Fraser <keir.xen@gmail.com>
To: Philippe.Simonet@swisscom.com, Ian.Campbell@citrix.com
Cc: jeremy@goop.org, xen-devel@lists.xensource.com,
dan.magenheimer@oracle.com, mrsanna1@gmail.com,
olivier.hanesse@gmail.com, JBeulich@suse.com,
xen-users@lists.xensource.com, mark@campbell-lange.net
Subject: Re: [Xen-users] Re: Xen 4 TSC problems
Date: Thu, 18 Oct 2012 17:43:26 +0100 [thread overview]
Message-ID: <CCA5F03E.41F79%keir.xen@gmail.com> (raw)
In-Reply-To: <FF93AF260AC2BB499A119CC65B092CF73148CC48@sg000713.corproot.net>
We have no idea yet whether this workaround even does any good.
-- Keir
On 18/10/2012 14:45, "Philippe.Simonet@swisscom.com"
<Philippe.Simonet@swisscom.com> wrote:
> in the meantime, it would be cool to have a kernel boot parameter that could
> disable this wrapping'
> correction' ? like <check-timer-wrap=false>
>
>> -----Original Message-----
>> From: xen-devel-bounces@lists.xen.org [mailto:xen-devel-
>> bounces@lists.xen.org] On Behalf Of Ian Campbell
>> Sent: Thursday, October 18, 2012 9:40 AM
>> To: Keir Fraser
>> Cc: Jeremy Fitzhardinge; xen-devel@lists.xensource.com; Dan
>> Magenheimer; Mauro; Olivier Hanesse; Jan Beulich; Xen Users; Mark Adams
>> Subject: Re: [Xen-devel] [Xen-users] Re: Xen 4 TSC problems
>>
>> On Wed, 2012-10-17 at 17:15 +0100, Keir Fraser wrote:
>>> @@ -540,6 +541,14 @@ static void plt_overflow(void *unused)
>>> plt_wrap = __read_platform_stime(plt_stamp64 + plt_mask + 1);
>>> if ( ABS(plt_wrap - now) > ABS(plt_now - now) )
>>> break;
>>> + rdtscll(tsc);
>>> + printk("XXX plt_overflow: plt_now=%"PRIx64" plt_wrap=%"PRIx64
>>> + " now=%"PRIx64" old_stamp=%"PRIx64" new_stamp=%"PRIx64
>>> + " plt_stamp64=%"PRIx64" plt_mask=%"PRIx64
>>> + " tsc=%"PRIx64" tsc_stamp=%"PRIx64"\n",
>>> + plt_now, plt_wrap, now, old_stamp, plt_stamp, plt_stamp64,
>>> + plt_mask, tsc, this_cpu(cpu_time).local_tsc_stamp);
>>> + break;
>>
>> Is the break here, making the following update to plt_stamp64 dead code
>> deliberate?
>>
>>> plt_stamp64 += plt_mask + 1;
>>> }
>>> if ( i != 0 )
>>
>> Ian.
>>
>>
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2012-10-18 16:43 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-23 10:49 Xen 4 TSC problems Olivier Hanesse
2011-02-23 16:16 ` [Xen-devel] " Dan Magenheimer
2011-02-23 17:19 ` Keir Fraser
2011-02-23 19:04 ` Olivier Hanesse
2011-02-24 7:16 ` Keir Fraser
2011-02-24 9:59 ` Olivier Hanesse
2011-02-24 10:59 ` Jan Beulich
2011-02-24 11:30 ` [Xen-devel] " Keir Fraser
2011-02-24 11:57 ` Olivier Hanesse
2011-02-24 12:37 ` Jan Beulich
2011-02-24 14:20 ` Olivier Hanesse
2011-02-24 14:52 ` [Xen-devel] " Keir Fraser
2011-02-24 17:43 ` Dan Magenheimer
2011-02-24 17:58 ` Olivier Hanesse
2011-02-24 19:01 ` [Xen-devel] " Jeremy Fitzhardinge
2011-02-28 14:37 ` Olivier Hanesse
2011-02-28 15:00 ` Keir Fraser
2011-02-28 15:14 ` [Xen-devel] " Dan Magenheimer
2011-02-28 15:23 ` Olivier Hanesse
2011-02-28 15:30 ` Dan Magenheimer
2011-02-28 15:54 ` Olivier Hanesse
2011-04-15 7:51 ` andre.arnold
2011-04-15 16:31 ` Olivier Hanesse
2012-09-27 15:54 ` [Xen-devel] " Mauro
2012-09-27 19:27 ` [Xen-users] " Dan Magenheimer
2012-09-27 21:28 ` Olivier Hanesse
2012-09-27 21:42 ` [Xen-devel] " Mauro
2012-09-29 8:08 ` [Xen-users] " Olivier Hanesse
2012-09-29 9:41 ` [Xen-devel] " Mauro
2012-09-29 12:19 ` Mauro
2012-09-30 15:13 ` [Xen-users] " Pasi Kärkkäinen
2012-09-30 19:23 ` [Xen-devel] " Mauro
2012-09-30 20:19 ` Mauro
2012-10-15 7:39 ` [Xen-users] " Olivier Hanesse
2012-10-15 8:05 ` Philippe.Simonet
2012-10-15 9:39 ` Mauro
2012-10-15 10:32 ` Jan Beulich
2012-10-15 11:24 ` [Xen-devel] " Mauro
2012-10-15 12:49 ` [Xen-users] " Jan Beulich
2012-10-15 14:25 ` Mauro
2012-10-17 16:15 ` Keir Fraser
2012-10-18 7:40 ` Ian Campbell
2012-10-18 7:55 ` Keir Fraser
2012-10-18 8:33 ` Ian Campbell
2012-10-18 8:56 ` [Xen-devel] " Mauro
2012-10-18 9:36 ` [Xen-users] " Ian Campbell
2012-10-18 13:45 ` Philippe.Simonet
2012-10-18 16:43 ` Keir Fraser [this message]
2012-10-21 20:52 ` [Xen-devel] " Mauro
2012-10-22 6:54 ` [Xen-users] " Jan Beulich
2012-10-22 9:17 ` [Xen-devel] " Mauro
2012-10-22 9:27 ` [Xen-users] " Jan Beulich
2012-10-22 10:40 ` [Xen-devel] " Mauro
2012-10-22 12:06 ` [Xen-users] " Jan Beulich
2012-10-23 7:19 ` Mauro
[not found] ` <CAE17a0VU3H8UmUWZv1+t98ME8LFgCZAWWBC1nhzM=ecbu6_GaQ@mail.gmail.com>
2012-10-23 7:58 ` Jan Beulich
2012-10-23 8:40 ` Mauro
2012-10-23 8:50 ` Jan Beulich
2012-10-23 11:50 ` Konrad Rzeszutek Wilk
2012-10-23 14:07 ` Mauro
2012-10-23 14:43 ` Jan Beulich
2012-10-23 14:46 ` Mauro
2012-10-23 15:34 ` Mauro
2012-10-23 15:49 ` Jan Beulich
2012-10-01 11:39 ` Zary Matej
2011-02-28 15:39 ` [Xen-devel] " Keir Fraser
2012-09-29 15:13 ` Mauro
2011-09-13 7:16 ` Philippe Simonet
2011-09-15 8:23 ` Konrad Rzeszutek Wilk
2011-09-15 8:24 ` Konrad Rzeszutek Wilk
2011-09-15 16:24 ` Jeremy Fitzhardinge
2011-09-16 6:03 ` Philippe.Simonet
2011-09-16 22:40 ` Jeremy Fitzhardinge
2011-09-19 5:45 ` Philippe Simonet
2011-09-15 10:36 ` George Dunlap
2011-09-15 18:38 ` Dan Magenheimer
2011-09-19 10:39 ` George Dunlap
2011-09-22 12:07 ` Jan Beulich
2011-09-30 6:33 ` Philippe.Simonet
2011-09-30 9:36 ` tommics
2011-09-30 17:16 ` Dan Magenheimer
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