Re: hrtimer_interrupt time sync issues across cores

2017-12-13 Thread Greg KH
On Wed, Dec 13, 2017 at 11:01:57PM -0800, Rajasekaran Chandrasekaran wrote: > Hi, > > > In our multi-core x86 based system that is running 3.4.19 version of > kernel, hrtimer_interrupt (called from apic_timer_interrupt) keeps looping > in hardirq for atleast 1.6 seconds. We use tsc as our clock

hrtimer_interrupt time sync issues across cores

2017-12-13 Thread Rajasekaran Chandrasekaran
Hi, In our multi-core x86 based system that is running 3.4.19 version of kernel, hrtimer_interrupt (called from apic_timer_interrupt) keeps looping in hardirq for atleast 1.6 seconds. We use tsc as our clock source. The issue happens very rarely in our system and hard to reproduce. Problem:

Re: Virtual Memory map

2017-12-13 Thread arshad hussain
On Wed, Dec 13, 2017 at 1:58 PM, Damian Tometzki wrote: > Hello, > > On more question. The second example: > > 8000 - 87ff (=43 bits) guard hole, reserved for > hypervisor > > > What are the relation between the Bits (=43bits) and the Adresse Range ? If user-space stars an

Re: Virtual Memory map

2017-12-13 Thread Damian Tometzki
Hello, On more question. The second example: >> 8000 - 87ff (=43 bits) guard hole, reserved for >> hypervisor What are the relation between the Bits (=43bits) and the Adresse Range ? Is it possible to calculate the 43 Bits from the range ? If yes, how ? Best regards