[discoball]

Sorry, within 2ms not absolute 0, but to me it might as well be zero I've yet to notice it in practice.

[mkl]

For a network driver, 2ms seems enormous. At 1Gbps that's 250 kilobytes, which is an awful lot of packets.

[discoball]

But GC doesn’t run continuously! Sure, device drivers and kernel modules should be built in C. Everything else is an approximation.