Sorry, last line should have been: "intended to get an impression of how widespread ***knowledge of*** DPDK's core operating inefficiency is", not: "intended to get an impression of how widespread DPDK's core operating inefficiency is"
On Tue, Feb 23, 2021 at 8:22 AM Etienne-Victor Depasquale <ed...@ieee.org> wrote: > Beyond RX/TX CPU affinity, in DANOS you can further tune power consumption >> by changing the adaptive polling rate. It doesn’t, per the survey, "keep >> utilization at 100% regardless of packet activity.” >> > Robert, you seem to be conflating DPDK > with DANOS' power control algorithms that modulate DPDK's default > behaviour. > > Let me know what you think; otherwise, I'm pretty confident that DPDK does: > >> "keep utilization at 100% regardless of packet activity.” > > > Keep in mind that this is a bare-bones survey intended for busy, > knowledgeable people (the ones you'd find on NANOG) - > not a detailed breakdown of modes of operation of DPDK or DANOS. > DPDK has been designed for fast I/O that's unencumbered by the trappings > of general-purpose OSes, > and that's the impression that needs to be forefront. > Power control, as well as any other dimensions of modulation, > are detailed modes of operation that are well beyond the scope of a > bare-bones 2-question survey > intended to get an impression of how widespread DPDK's core operating > inefficiency is. > > Cheers, > > Etienne > > On Mon, Feb 22, 2021 at 10:20 PM Robert Bays <rob...@gdk.org> wrote: > >> Beyond RX/TX CPU affinity, in DANOS you can further tune power >> consumption by changing the adaptive polling rate. It doesn’t, per the >> survey, "keep utilization at 100% regardless of packet activity.” Adaptive >> polling changes in DPDK optimize for tradeoffs between power consumption, >> latency/jitter and drops during throughput ramp up periods. Ideally your >> DPDK implementation has an algorithm that tries to automatically optimize >> based on current traffic patterns. >> >> In DANOS refer to the “system default dataplane power-profile” config >> command tree for adaptive polling settings. Interface RX/TX affinity is >> configured on a per interface basis under the “interfaces dataplane” config >> command tree. >> >> -robert >> >> >> > On Feb 22, 2021, at 11:46 AM, Jared Geiger <ja...@compuwizz.net> wrote: >> > >> > DANOS lets you specify how many dataplane cores you use versus control >> plane cores. So if you put a 16 core host in to handle 2GB of traffic, you >> can adjust the dataplane worker cores as needed. Control plane cores don't >> stay at 100% utilization. >> > >> > I use that technique plus DANOS runs on VMware (not oversubscribed) >> which allows me to use the hardware for other VMs. NICS are attached to the >> VM via PCI Passthrough which helps eliminate the overhead to the VMware >> hypervisor itself. >> > >> > I have an 8 core VM with 4 cores set to dataplane and 4 to control >> plane. The 4 control plane cores are typically idle only processing BGP >> route updates, SNMP, logs, etc. >> > >> > ~Jared >> > >> > On Sun, Feb 21, 2021 at 11:30 PM Etienne-Victor Depasquale < >> ed...@ieee.org> wrote: >> > Hello folks, >> > >> > I've just followed a thread regarding use of CGNAT and noted a >> suggestion (regarding DANOS) that includes use of DPDK. >> > >> > As I'm interested in the breadth of adoption of DPDK, and as I'm a >> researcher into energy and power efficiency, I'd love to hear your feedback >> on your use of power consumption control by DPDK. >> > >> > I've drawn up a bare-bones, 2-question survey at this link: >> > >> > https://www.surveymonkey.com/r/J886DPY. >> > >> > Responses have been set to anonymous. >> > >> > Cheers, >> > >> > Etienne >> > >> > -- >> > Ing. Etienne-Victor Depasquale >> > Assistant Lecturer >> > Department of Communications & Computer Engineering >> > Faculty of Information & Communication Technology >> > University of Malta >> > Web. https://www.um.edu.mt/profile/etiennedepasquale >> >> > > -- > Ing. Etienne-Victor Depasquale > Assistant Lecturer > Department of Communications & Computer Engineering > Faculty of Information & Communication Technology > University of Malta > Web. https://www.um.edu.mt/profile/etiennedepasquale > -- Ing. Etienne-Victor Depasquale Assistant Lecturer Department of Communications & Computer Engineering Faculty of Information & Communication Technology University of Malta Web. https://www.um.edu.mt/profile/etiennedepasquale
