lkml.org 
[lkml]   [2021]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [LKP] Re: [clocksource] 6c52b5f3cf: stress-ng.opcode.ops_per_sec -14.4% regression
Date
On Sat, Apr 24 2021 at 20:29, Feng Tang wrote:
> On Fri, Apr 23, 2021 at 07:02:54AM -0700, Paul E. McKenney wrote:
> And I'm eager to know if there is any real case of an unreliable tsc
> on the 'large numbers' of x86 system which complies with our cpu feature
> check. And if there is, my 2/2 definitely should be dropped.

Nothing prevents BIOS tinkerers from trying to be 'smart'. My most
recent encounter (3 month ago) was on a laptop where TSC drifted off on
CPU0 very slowly, but was caught due to the TSC_ADJUST check in idle.

I'm still thinking about a solution to avoid that extra timer and the
watchdog for these systems, but haven't found anything which I don't
hate with a passion yet.

Thanks,

tglx

\
 
 \ /
  Last update: 2021-04-26 14:42    [W:0.220 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site