On Fri, Jun 30, 2017 at 8:02 PM, Jerome Shidel <jer...@shidel.net> wrote:
> In case you haven't heard, there is a severe bug in Intel Skylake and Newer 
> CPUs.

Most of us aren't trendy. This Nehalem Westmere (Core gen #1) is my
newest machine (so far).   ;-)

> I only know a little about it. From what I heard, it crops up with 
> hyper-threading
> inside loops less than 64 bytes effecting several high byte registers (AH, 
> BH, etc).
> They are working on a microcode patch and hopefully will have it out soon.

Don't panic! Bugs are part of life ("par for the course").


> So, I guess it could effect DOS asm code running inside a VM.
> I think it's been a while since there last major bug. Last one I recall was 
> that Pentium 90 Floating Point problem.

You mean the FDIV bug? That was fixed in 120 Mhz (and higher) models.

But there have always been other cpu bugs:

* https://en.wikipedia.org/wiki/Pentium_F00F_bug
* (P3 serializing bug)

So this is far from the last one we'll see.

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