Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [PATCH v3 00/31] Hardware Events Report Mecanism (HERM) | Date | Mon, 13 Feb 2012 21:29:22 +0000 |
| |
> For CE, it is able to detect what dimm has problem, but, when lockstep is > enabled, an Uncorrected Error would point to the two channels at the affected > branch. Also, when memory mirror is enabled, there are 4 DIMMs associated to the > same 128-bit memory address. Any one of those memories could be affected by > the error. Only the Sandy Bridge driver handles memory mirror, and I'll need > to add some extra logic to the location detect algorithm, in order to work > with it (it is currently on my TODO list).
This looks like a hard problem to solve. In mirror mode memory writes go to both sides, reads come from the master. To determine the location of the error you'd need to know which set was the master at the time the error was detected. Note that can change (and since we know we just had an error it might have been switched because of the error we just saw). We don't have any visibility from the OS as to what the BIOS is doing with mirrors.
-Tony
| |