An occasional 1 bit correction is very common compared to chipkill, so there is a huge benefit to ECC without chipkill. In fact, with 1000s of servers, I've never had chipkill give me any benefit. I guess I'm too small to see the effect from chipkill. But yes, I do see 1-bit corrections.
Yeah, not advocating for chipkill, but the OS has to know how to interpret the machine check syndromes, is all I was getting at. This has been a problem for me on Skylake-SP with Linux, to name one.
I've always had to go out of my way to find single-bit correction numbers in Linux. I suspect that once you find that, noticing a chipkill event is pretty easy. But I've never seen a chipkill event, despite having a lot of DRAM for a long time.
