lkml.org 
[lkml]   [2019]   [Aug]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] KVM: LAPIC: Periodically revaluate appropriate lapic_timer_advance_ns
On Fri, 9 Aug 2019 at 18:24, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 09/08/19 07:45, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@tencent.com>
> >
> > Even if for realtime CPUs, cache line bounces, frequency scaling, presence
> > of higher-priority RT tasks, etc can cause different response. These
> > interferences should be considered and periodically revaluate whether
> > or not the lapic_timer_advance_ns value is the best, do nothing if it is,
> > otherwise recaluate again.
>
> How much fluctuation do you observe between different runs?

Sometimes can ~1000 cycles after converting to guest tsc freq.

Regards,
Wanpeng Li

\
 
 \ /
  Last update: 2019-08-12 11:06    [W:0.411 / U:0.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site