[Bloat] Router congestion, slow ping/ack times with kernel 5.4.60

[Thomas Rosenstein]

On 7 Nov 2020, at 17:46, Jesper Dangaard Brouer wrote:

>
> Did the latency issue happen during this this perf recording?
> (it is obviously important that you record during the issue)

yes it was recorded during the transfer, while it exhibited the issue

I let the transfer run some time, then did the perf extract, stopped the 
transfer afterwards.

>
> Finding a single latency event/issue in perf.data is like looking in
> for needle in a haystack.  It does give hints and e.g. tell me details
> like what part of the kernel are used/activated.
>
> I can see that you have likely configured XPS (Transmit Packet
> Steering). Is this on purpose?

Not on purpose, I assume it comes from the Mellanox Card.

>
> -- 
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer