Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-23 Thread Jan Beulich
>>> On 23.03.16 at 13:05, wrote: > On 03/23/2016 07:28 AM, Jan Beulich wrote: >> Sure - it seems quite obvious that all boot time available CPUs >> should be checked. > Cool, so I will go with moving init_xen_time right after all CPUs are up but > before initcalls are invoked. I think your other

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-23 Thread Joao Martins
On 03/23/2016 07:28 AM, Jan Beulich wrote: On 22.03.16 at 21:40, wrote: >> On 03/22/2016 04:02 PM, Jan Beulich wrote: >> On 22.03.16 at 16:51, wrote: On 03/22/2016 12:46 PM, Jan Beulich wrote: On 22.03.16 at 13:41, wrote: >>> >> I found out one issue in the tsc c

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-23 Thread Jan Beulich
>>> On 22.03.16 at 21:40, wrote: > On 03/22/2016 04:02 PM, Jan Beulich wrote: > On 22.03.16 at 16:51, wrote: >>> On 03/22/2016 12:46 PM, Jan Beulich wrote: >>> On 22.03.16 at 13:41, wrote: >> > I found out one issue in the tsc clocksource initialization path with > respect t

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-22 Thread Joao Martins
On 03/22/2016 04:02 PM, Jan Beulich wrote: On 22.03.16 at 16:51, wrote: > >> >> On 03/22/2016 12:46 PM, Jan Beulich wrote: >> On 22.03.16 at 13:41, wrote: >>> On 03/18/2016 08:21 PM, Andrew Cooper wrote: > On 17/03/16 16:12, Joao Martins wrote: >> Introduce support f

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-22 Thread Jan Beulich
>>> On 22.03.16 at 16:51, wrote: > > On 03/22/2016 12:46 PM, Jan Beulich wrote: > On 22.03.16 at 13:41, wrote: >> >>> >>> On 03/18/2016 08:21 PM, Andrew Cooper wrote: On 17/03/16 16:12, Joao Martins wrote: > Introduce support for using TSC as platform time which is the highest >>>

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-22 Thread Joao Martins
On 03/22/2016 12:46 PM, Jan Beulich wrote: On 22.03.16 at 13:41, wrote: > >> >> On 03/18/2016 08:21 PM, Andrew Cooper wrote: >>> On 17/03/16 16:12, Joao Martins wrote: Introduce support for using TSC as platform time which is the highest resolution time and most performant to get

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-22 Thread Jan Beulich
>>> On 22.03.16 at 13:41, wrote: > > On 03/18/2016 08:21 PM, Andrew Cooper wrote: >> On 17/03/16 16:12, Joao Martins wrote: >>> Introduce support for using TSC as platform time which is the highest >>> resolution time and most performant to get (~20 nsecs). Though there >>> are also several pro

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-22 Thread Joao Martins
On 03/18/2016 08:21 PM, Andrew Cooper wrote: > On 17/03/16 16:12, Joao Martins wrote: >> Introduce support for using TSC as platform time which is the highest >> resolution time and most performant to get (~20 nsecs). Though there >> are also several problems associated with its usage, and there

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-21 Thread Joao Martins
On 03/18/2016 08:21 PM, Andrew Cooper wrote: > On 17/03/16 16:12, Joao Martins wrote: >> Introduce support for using TSC as platform time which is the highest >> resolution time and most performant to get (~20 nsecs). Though there >> are also several problems associated with its usage, and there

Re: [Xen-devel] [PATCH 2/5] x86/time: implement tsc as clocksource

2016-03-19 Thread Andrew Cooper
On 17/03/16 16:12, Joao Martins wrote: > Introduce support for using TSC as platform time which is the highest > resolution time and most performant to get (~20 nsecs). Though there > are also several problems associated with its usage, and there isn't a > complete (and architecturally defined) gu