Hi Filip, i have not seen the same issues. Are you aware of this tuning guide? I applied it and had no issues with intel 100G NIC.
HPC Tuning Guide for AMD EPYC Processors http://developer.amd.com/wp-content/resources/56420.pdf Hope it helps. Cheers, Steffen Weise > Am 11.09.2021 um 10:56 schrieb Filip Janiszewski > <cont...@filipjaniszewski.com>: > > I ran more tests, > > This AMD server is a bit confusing, I can tune it to capture 28Mpps (64 > bytes frame) from one single core, so I would assume that using one more > core will at least increase a bit the capture capabilities, but it's > not, 1% more speed and it drops regardless of how many queues are > configured - I've not observed this situation on the Intel server, where > adding more queues/cores scale to higher throughput. > > This issue have been verified now with both Mellanox and Intel (810 > series, 100GbE) NICs. > > Anybody encountered anything similar? > > Thanks > > Il 9/10/21 3:34 PM, Filip Janiszewski ha scritto: >> Hi, >> >> I've switched a 100Gbe MLX ConnectX-4 card from an Intel Xeon server to >> an AMD EPYC server (running 75F3 CPU, 256GiB of RAM and PCIe4 lanes), >> and using the same capture software we can't get any faster than 10Gbps, >> when exceeding that speed regardless of the amount of queues configured >> the rx_discards_phy counter starts to raise and packets are lost in huge >> amounts. >> >> On the Xeon machine, I was able to get easily to 50Gbps with 4 queues. >> >> Is there any specific DPDK configuration that we might want to setup for >> those AMD servers? The software is DPDK based so I wonder if some build >> option is missing somewhere. >> >> What else I might want to look for to investigate this issue? >> >> Thanks >> > > -- > BR, Filip > +48 666 369 823
