Re: git: 00d061855deb - main - Garbage-collect ACPI-safe timer and friends

From: Colin Percival <cperciva_at_freebsd.org>
Date: Fri, 21 Jun 2024 11:47:50 UTC 
On 6/21/24 00:38, Poul-Henning Kamp wrote:
> --------
> Colin Percival writes:
> 
>> commit 00d061855deb93df5d709c8a794985ebb55012f8
>>
>>      Garbage-collect ACPI-safe timer and friends
>>      
>>      In 2001 when the ACPI timer was introduced, it included code to check
>>      for a bug present in some Pentium II and Pentium III chipsets;
> 
> Boy, does that bring back memories...
> 
> Apologies for not taking this out behind the barn myself, I had totally
> forgotten about it.

I only became aware of this in 2021 when I noticed that every time we booted
we spent 140 ms checking if we had this chipset bug.  The workaround could
probably have stuck around for another 20 years if it had been faster. ;-)

-- 
Colin Percival
FreeBSD Release Engineering Lead & EC2 platform maintainer
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid