* [Bloat] one big bump in the wire for latency monitoring @ 2018-01-25 20:00 Dave Taht 2018-01-25 22:15 ` Toke Høiland-Jørgensen 0 siblings, 1 reply; 3+ messages in thread From: Dave Taht @ 2018-01-25 20:00 UTC (permalink / raw) To: bloat https://blog.apnic.net/2018/01/22/ruru-real-time-wide-area-tcp-latency-monitoring/ -- Dave Täht CEO, TekLibre, LLC http://www.teklibre.com Tel: 1-669-226-2619 ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bloat] one big bump in the wire for latency monitoring 2018-01-25 20:00 [Bloat] one big bump in the wire for latency monitoring Dave Taht @ 2018-01-25 22:15 ` Toke Høiland-Jørgensen 2018-01-26 8:50 ` Jesper Dangaard Brouer 0 siblings, 1 reply; 3+ messages in thread From: Toke Høiland-Jørgensen @ 2018-01-25 22:15 UTC (permalink / raw) To: Dave Taht, bloat Dave Taht <dave.taht@gmail.com> writes: > https://blog.apnic.net/2018/01/22/ruru-real-time-wide-area-tcp-latency-monitoring/ Neat! The packet tapping part could probably be implemented in XDP to avoid the DPDK space heater... ;) -Toke ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Bloat] one big bump in the wire for latency monitoring 2018-01-25 22:15 ` Toke Høiland-Jørgensen @ 2018-01-26 8:50 ` Jesper Dangaard Brouer 0 siblings, 0 replies; 3+ messages in thread From: Jesper Dangaard Brouer @ 2018-01-26 8:50 UTC (permalink / raw) To: Toke Høiland-Jørgensen; +Cc: Dave Taht, bloat, brouer, xdp-newbies On Thu, 25 Jan 2018 23:15:17 +0100 Toke Høiland-Jørgensen <toke@toke.dk> wrote: > Dave Taht <dave.taht@gmail.com> writes: > > > https://blog.apnic.net/2018/01/22/ruru-real-time-wide-area-tcp-latency-monitoring/ > > Neat! The packet tapping part could probably be implemented in XDP to > avoid the DPDK space heater... ;) I was thinking the exact same thing ;-) It should be fairly simple to write a XDP/eBPF program, that timestamp via bpf_ktime_get_ns() and queue the events via a perf ring-buffer via bpf_perf_event_output() (the only kernel example is [1]). And a userspace side tool[2] that reads these perf_event's. Cc. xdp-newbies@vger.kernel.org hoping someone want to give it a go? [1] https://github.com/torvalds/linux/blob/master/samples/bpf/trace_output_kern.c [2] https://github.com/torvalds/linux/blob/master/samples/bpf/trace_output_user.c -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-01-26 8:50 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-01-25 20:00 [Bloat] one big bump in the wire for latency monitoring Dave Taht 2018-01-25 22:15 ` Toke Høiland-Jørgensen 2018-01-26 8:50 ` Jesper Dangaard Brouer
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