> On Aug 17, 2020, at 10:52 AM, Benoit Ganne (bganne) via lists.fd.io > <bganne=cisco....@lists.fd.io> wrote: > > Hi Christian, > > I am CC'ing csit-dev but here are some elements. > > AFAIK, CSIT results are not trustworthy for Mellanox NIC yet unfortunately: > T-Rex suffers from "stretch duration" when using Mellanox NIC to inject > traffic. > Here is my understanding of what this means: when asked to send at X packets > in Y seconds (hence at a rate of X/Y pps), T-Rex effectively takes Y + Z > seconds. CSIT figures are based on the programmed rate (X/Y) and not the real > rate (X/(Y+Z)). > In a nutshell: we are not really sure where we're at with Mellanox card in > CSIT.
This is very interesting. I believe I am seeing this stretch from trex as well; however, it happens with i710 as well as a cx5 cards in the trex tester. Basically I tell trex to start then after the expected amount of time (for which I'm doing other sampling) I tell the trex client to wait for traffic to complete. I would expect this to return immediately as I've been timing things. Instead it is taking longer (perhaps much longer) depending on how high the rate was that I tried to send. c.start(ports=check_ports, mult=mult, duration=duration) [wait duration seconds doing sampling] c.wait_on_traffic(rx_delay_ms=100) Thanks, Chris. > Your figures look similar to what I get on my setup (~20Mpps bi-directional > for IPv4 forwarding). > > Best > ben > >> -----Original Message----- >> From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Christian >> Hopps >> Sent: lundi 17 août 2020 15:00 >> To: vpp-dev <vpp-dev@lists.fd.io> >> Cc: Christian Hopps <cho...@chopps.org> >> Subject: [vpp-dev] Question on performance tests.. >> >> [sent to csit-dev but perhaps since I'm not subscribed it didn't post] >> >> I'm looking at this performance graph: >> >> https://docs.fd.io/csit/master/trending/trending/ip4-2n-clx-cx556a.html >> >> Is this a uni-directional or a bi-directional test? >> >> There is a huge performance gain between June and July it seems. Do we >> know which change this was? I'm on a current vpp master and I am only >> getting about 9Mpps+ bidirectional (18Mpps total) with IPv4 forwarding of >> 64 octet packets with 100GE Cx5 cards and Trex. >> >> Thanks, >> Chris. >
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