> On Aug 17, 2020, at 10:52 AM, Benoit Ganne (bganne) via 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 On Behalf Of Christian
>> Hopps
>> Sent: lundi 17 août 2020 15:00
>> To: vpp-dev
>> Cc: Christian Hopps
>> 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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