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Re: [v1 0/9] Early boot time stamps for x86

From Pasha Tatashin <pasha.tatashin@oracle.com>
Newsgroups linux.kernel
Subject Re: [v1 0/9] Early boot time stamps for x86
Date 2017-03-23 01:10 +0100
Message-ID <tnYue-2mn-11@gated-at.bofh.it> (permalink)
References <tnUTE-85w-19@gated-at.bofh.it> <tnVcZ-8hP-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Hi Peter,

Thank you for looking at this patchset.

Yes, I am certain it is 0 or  near 0 on reset on this machine. Because, 
I actually wondered about it, and used stop watch as an alternative way 
to verify the result, twice.

While, I suspect it is often the case that on reset tsc is 0, it is not 
really import, as the offset value is not the important part of the 
project. The important part is that we can cover the whole Linux boot 
process with timestamps, and know where spend time, and avoid 
regressions in the future.

Thank you,
Pasha

On 2017-03-22 16:28, Peter Zijlstra wrote:
> On Wed, Mar 22, 2017 at 04:24:16PM -0400, Pavel Tatashin wrote:
>> - early tsc offset is 549s, so it took over 9 minutes to get through POST,
>>   and GRUB before starting linux
>
> Lol, how cute. You assume TSC starts at 0 on reset.
>

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Thread

[v1 0/9] Early boot time stamps for x86 Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-03-22 21:30 +0100
  [v1 5/9] x86/tsc: disable early messages from quick_pit_calibrate Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-03-22 21:30 +0100
  Re: [v1 0/9] Early boot time stamps for x86 Peter Zijlstra <peterz@infradead.org> - 2017-03-22 21:40 +0100
    Re: [v1 0/9] Early boot time stamps for x86 Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-03-23 01:10 +0100
  Re: [v1 0/9] Early boot time stamps for x86 Peter Zijlstra <peterz@infradead.org> - 2017-03-22 21:40 +0100
    Re: [v1 0/9] Early boot time stamps for x86 Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-03-23 01:10 +0100
      Re: [v1 0/9] Early boot time stamps for x86 Thomas Gleixner <tglx@linutronix.de> - 2017-03-23 12:00 +0100
        Re: [v1 0/9] Early boot time stamps for x86 Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-03-23 15:50 +0100
          Re: [v1 0/9] Early boot time stamps for x86 Thomas Gleixner <tglx@linutronix.de> - 2017-03-23 19:50 +0100

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