lkml.org 
[lkml]   [2014]   [Mar]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] x86: hpet: Don't default CONFIG_HPET_TIMER to be y for X86_64
From
On Thu, Mar 27, 2014 at 12:52 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On 03/27/2014 04:02 AM, Clemens Ladisch wrote:
>> Feng Tang wrote:
>> The help text still says:
>> | You can safely choose Y here. [...]
>> | Choose N to continue using the legacy 8254 timer.
>>
>> Are these statements still true for those platforms?
>
> They aren't true for modern desktop and server platforms -- the TSC is
> used regardless of hpet availability.

While I suspect the comment above is in relation to the non-apic
timer. But with respect to timekeeping, our point is true assuming the
TSC isn't mucked up by the BIOS. My 1yr old i7-3930k single socket
system still has some wonky BIOS bug that offsets the boot core's TSC.
And that's intel's bios, so I can only imagine other vendors have
found other ways to cause trouble.

So yea, the hpet availability for timekeeping is still important, as
the TSC can still be problematic.

thanks
-john


\
 
 \ /
  Last update: 2014-03-27 23:01    [W:0.291 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site