* events/0 and xenconsoled wakeups
@ 2011-03-25 22:28 Sander Eikelenboom
2011-03-29 21:14 ` Jeremy Fitzhardinge
0 siblings, 1 reply; 4+ messages in thread
From: Sander Eikelenboom @ 2011-03-25 22:28 UTC (permalink / raw)
To: Jeremy Fitzhardinge; +Cc: xen-devel@lists.xensource.com
Hi Jeremy,
Is this thing still on your list ?
http://www.gossamer-threads.com/lists/linux/kernel/1281515
Ran powertop today, and events/0 and xenconsoled seem to be still responsible for the majority of wakeups.
--
Sander
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: events/0 and xenconsoled wakeups
2011-03-25 22:28 events/0 and xenconsoled wakeups Sander Eikelenboom
@ 2011-03-29 21:14 ` Jeremy Fitzhardinge
2011-03-31 12:19 ` Sander Eikelenboom
0 siblings, 1 reply; 4+ messages in thread
From: Jeremy Fitzhardinge @ 2011-03-29 21:14 UTC (permalink / raw)
To: Sander Eikelenboom; +Cc: xen-devel@lists.xensource.com
On 03/25/2011 03:28 PM, Sander Eikelenboom wrote:
> Hi Jeremy,
>
> Is this thing still on your list ?
> http://www.gossamer-threads.com/lists/linux/kernel/1281515
>
> Ran powertop today, and events/0 and xenconsoled seem to be still responsible for the majority of wakeups.
Yeah. Unfortunately the underlying bug is a design error in the tty
subsystem, which will be hard to fix. However, the one-liner fix can
mitigate the problem and reduce the wakeups to 100Hz.
Also, attaching a console to the various hvcs will also fix it.
J
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: events/0 and xenconsoled wakeups
2011-03-29 21:14 ` Jeremy Fitzhardinge
@ 2011-03-31 12:19 ` Sander Eikelenboom
2011-03-31 17:34 ` Jeremy Fitzhardinge
0 siblings, 1 reply; 4+ messages in thread
From: Sander Eikelenboom @ 2011-03-31 12:19 UTC (permalink / raw)
To: Jeremy Fitzhardinge; +Cc: xen-devel@lists.xensource.com
Hello Jeremy,
Tuesday, March 29, 2011, 11:14:04 PM, you wrote:
> On 03/25/2011 03:28 PM, Sander Eikelenboom wrote:
>> Hi Jeremy,
>>
>> Is this thing still on your list ?
>> http://www.gossamer-threads.com/lists/linux/kernel/1281515
>>
>> Ran powertop today, and events/0 and xenconsoled seem to be still responsible for the majority of wakeups.
> Yeah. Unfortunately the underlying bug is a design error in the tty
> subsystem, which will be hard to fix. However, the one-liner fix can
> mitigate the problem and reduce the wakeups to 100Hz.
> Also, attaching a console to the various hvcs will also fix it.
Consoles of guests ?
Could you give a example of how to do it ?
> J
--
Best regards,
Sander mailto:linux@eikelenboom.it
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: events/0 and xenconsoled wakeups
2011-03-31 12:19 ` Sander Eikelenboom
@ 2011-03-31 17:34 ` Jeremy Fitzhardinge
0 siblings, 0 replies; 4+ messages in thread
From: Jeremy Fitzhardinge @ 2011-03-31 17:34 UTC (permalink / raw)
To: Sander Eikelenboom; +Cc: xen-devel@lists.xensource.com
On 03/31/2011 05:19 AM, Sander Eikelenboom wrote:
> Hello Jeremy,
>
> Tuesday, March 29, 2011, 11:14:04 PM, you wrote:
>
>> On 03/25/2011 03:28 PM, Sander Eikelenboom wrote:
>>> Hi Jeremy,
>>>
>>> Is this thing still on your list ?
>>> http://www.gossamer-threads.com/lists/linux/kernel/1281515
>>>
>>> Ran powertop today, and events/0 and xenconsoled seem to be still responsible for the majority of wakeups.
>> Yeah. Unfortunately the underlying bug is a design error in the tty
>> subsystem, which will be hard to fix. However, the one-liner fix can
>> mitigate the problem and reduce the wakeups to 100Hz.
>> Also, attaching a console to the various hvcs will also fix it.
> Consoles of guests ?
> Could you give a example of how to do it ?
Just running "xl console <domid>" will drain the pending console output,
and stop all the wakeups. I think you can get xenconsoled to log into a
file (or /dev/null) which will also fix it. The wakeups come from
having unconsumed console output from the guest sitting in the pty buffer.
J
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-03-31 17:34 UTC | newest]
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2011-03-25 22:28 events/0 and xenconsoled wakeups Sander Eikelenboom
2011-03-29 21:14 ` Jeremy Fitzhardinge
2011-03-31 12:19 ` Sander Eikelenboom
2011-03-31 17:34 ` Jeremy Fitzhardinge
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