[twtrgrunt]

I thought the kernel was pretty stable. My first team at twitter I think we ran into 2 or 3 kernel bugs that year. I couldn't believe it but for some problems the blaming the kernel is a real debugging step (and even the bios lol). I think I had two perf problems turn into upstream patches thanks to the kernel team.

[johannes1234321]

It's not only about bugs, but if you know your workload and your systems you can do some tricks a general purpose kernel can't do to tweak it for your needs and get a benefit here or there for your code.