8 Dec
2020
8 Dec
'20
9:48 a.m.
On Mon, Dec 07, 2020 at 06:41:41PM +0100, Thomas Gleixner wrote:
Right this happens still occasionally, but for quite some time this is 100% firmware sillyness and not a fundamental property of the hardware anymore.
Ever since Nehalem (2008) TSC is synchronized on <= 2 sockets, and any observed deviation is firmware fail. I don't remember exactly where 4 socket and up got reliable.
(there's the physical hotplug case, but let's not make this complicated)
AMD has had Constant TSC since Barcelona which is roughly the same timeframe IIRC.
So basically every TSC fail in the last decase is due to firmware being shit.