"The discussion on enabling kernel preemption, for example, could have benefited from a mention of the reliability concerns which have kept most distributors from turning preemption on."
What are these reliability concerns, exactly?
I've seen Ben Collins (of Ubuntu) for instance making seperate 'lowlatency' kernels with preempt available mentioning that he only makes them available by popular demand, but without any guarantees on their reliability. I always assumed that this was based on some inane assumptions about preempt that are ultimately incorrect, but from this remark it seems he's not the only one - he might actually have a case.
What is going on with preempt?
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