Messages in this thread | | | Date | Mon, 10 Nov 1997 03:39:05 -0600 (CST) | From | Andrew Kieschnick <> | Subject | Re: Pentium DEATH and Cyrix COMA in user-mode |
| |
On Mon, 10 Nov 1997, Alan Cox wrote:
> > The pentium bug is caused by the chip executing an invalid opcode - its > > really a very different bug from the cyrix bug.... I doubt > > enabling/disabling anything is going to help with the pentium bug. > > They are very similar it appears. One is "lock cmpxchg8" which causes a double > lock cycle on the bus (I believe its to the bus), the other is a dual issue > of an implicitly locked operation (again dual lock).
Hmm. Indeed, thats pretty similar... hadn't thought about that.
I still say that they're also significantly different in that the pentium is executing what should be an invalid instruction, and the cyrix is executing valid instructions stupidly.
later, Andrew Kieschnick
| |