netem: add uapi to express delay and jitter in nanoseconds

netem userspace has long relied on a horrible /proc/net/psched hack to translate the current notion of "ticks" to nanoseconds. Expressing latency and jitter instead, in well defined nanoseconds, increases the dynamic range of emulated delays and jitter in netem. It will also ease a transition where reducing a tick to nsec equivalence would constrain the max delay in prior versions of netem to only 4.3 seconds.

Dave Taht committed 9 years ago

Commit 99803171 parent 112f9cb2 files · +16 −0Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/pkt_sched.h+2−0

@@ -537,6 +537,8 @@ enum { · 536 unmodified lines
537	TCA_NETEM_ECN,	537	TCA_NETEM_ECN,
538	TCA_NETEM_RATE64,	538	TCA_NETEM_RATE64,
539	TCA_NETEM_PAD,	539	TCA_NETEM_PAD,
		540	TCA_NETEM_LATENCY64,
		541	TCA_NETEM_JITTER64,
540	__TCA_NETEM_MAX,	542	__TCA_NETEM_MAX,
541	};	543	};
542		544