Difference between revisions of "VPP/FAQ"

Revision as of 15:01, 29 November 2017

Q: I'm using multiple vpp worker threads, yet only one of them is processing traffic. Why?
A: Hardware RSS hashing sends all traffic from a given flow to the same queue. Each queue is assigned to a single worker thread. Make sure that you're sending traffic from a reasonably large number of flows.
Q: Why do I see RX misses on an interface at a low data-rate?
A: Check to make sure that the Linux kernel isn't scheduling other work on the same core(s) as vpp. It just won't do for vpp to take a forced 10ms vacation in the middle of packet processing. Check out the vpp autoconfiguration tool.

Revision as of 14:52, 29 November 2017 (view source) Dbarach (Talk \| contribs) (Created page with "== Frequently Asked Questions == # Q: I'm using multiple vpp worker threads, yet only one of them is processing traffic. Why? <br /> A: Hardware RSS hashing sends all traffi...")		Revision as of 15:01, 29 November 2017 (view source) Dbarach (Talk \| contribs) m (→‎Frequently Asked Questions) Newer edit →
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	# Q: I'm using multiple vpp worker threads, yet only one of them is processing traffic. Why? <br /> A: Hardware RSS hashing sends all traffic from a given flow to the same queue. Each queue is assigned to a single worker thread. Make sure that you're sending traffic from a reasonably large number of flows.		# Q: I'm using multiple vpp worker threads, yet only one of them is processing traffic. Why? <br /> A: Hardware RSS hashing sends all traffic from a given flow to the same queue. Each queue is assigned to a single worker thread. Make sure that you're sending traffic from a reasonably large number of flows.
		+	# Q: Why do I see RX misses on an interface at a low data-rate? <br /> A: Check to make sure that the Linux kernel isn't scheduling other work on the same core(s) as vpp. It just won't do for vpp to take a forced 10ms vacation in the middle of packet processing. Check out the vpp autoconfiguration tool.