lkml.org 
[lkml]   [2016]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v13 00/12] support "task_isolation" mode
From
Date
On 7/21/2016 10:20 PM, Christoph Lameter wrote:
> On Thu, 21 Jul 2016, Chris Metcalf wrote:
>> On 7/20/2016 10:04 PM, Christoph Lameter wrote:
>> unstable, and then scheduling work to safely remove that timer.
>> I haven't looked at this code before (in kernel/time/clocksource.c
>> under CONFIG_CLOCKSOURCE_WATCHDOG) since the timers on
>> arm64 and tile aren't unstable. Is it possible to boot your machine
>> with a stable clocksource?
> It already as a stable clocksource. Sorry but that was one of the criteria
> for the server when we ordered them. Could this be clock adjustments?

We probably need to get clock folks to jump in on this thread!

Maybe it's disabling some built-in unstable clock just as part of
falling back to using the better, stable clock that you also have?
So maybe there's a way of just disabling that clocksource from the
get-go instead of having it be marked unstable later.

If you run the test again after this storm of unstable marking, does
it all happen again? Or is it a persistent state in the kernel?
If so, maybe you can just arrange to get to that state before starting
your application's task-isolation code.

Or, if you think it's clock adjustments, perhaps running your test with
ntpd disabled would make it work better?

--
Chris Metcalf, Mellanox Technologies
http://www.mellanox.com

\
 
 \ /
  Last update: 2016-07-22 17:01    [W:0.075 / U:1.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site