@probain said in Epyc VM to VM networking slow:
I restore the iptables again afterwards? Other than reboot
this worked for me
| action | command |
|---|---|
| save | iptables-save > firewall.conf |
| flush | iptables -F |
| restore | cat firewall.conf | iptables-restore |
G
Posts
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RE: Epyc VM to VM networking slowposted in Compute
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RE: Epyc VM to VM networking slowposted in Compute
Here are the opterons with dropped firewall:
source destination OS Kernel Speed Average vm dom debian 10 4.19.0-6-amd64 6.57 Gbits/sec dom vm debian 10 4.19.0-6-amd64 1.79 Gbits/sec vm dom truenas 6.6.20 2.01 Gbits/sec dom vm truenas 6.6.20 1.82 Gbits/sec host vm debian 10 4.19.0-6-amd64 5.32 Gbits/sec host vm truenas 6.6.20 1.92 Gbits/sec host dom debian 4.19.0+1 8.97 Gbits/sec -
RE: Epyc VM to VM networking slowposted in Compute
May someone could graph their vm.
Comparing a slow vm with a full speed could bring light into darknes.https://www.brendangregg.com/Articles/Linux_Kernel_Performance_Flame_Graphs.pdf
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RE: Epyc VM to VM networking slowposted in Compute
Just for completeness. I have the same issue with older AMD 6380 Opterons. The same hardware had full speed on esxi hypervisor. Also have full speed using harvester / rancher. I'm using xcp-ng for more than two years and have that issue since day one.
----------------------------------------------------------- Server listening on 5201 (test #1 - dom0 to workstation) ----------------------------------------------------------- [ ID] Interval Transfer Bitrate [ 5] 0.00-10.00 sec 10.8 GBytes 9.29 Gbits/sec receiver ----------------------------------------------------------- Server listening on 5201 (test #2 - vm to workstation) ----------------------------------------------------------- [ ID] Interval Transfer Bitrate [ 5] 0.00-10.00 sec 3.18 GBytes 2.73 Gbits/sec receiver ----------------------------------------------------------- Server listening on 5201 (test #3 dom0 to vm) ----------------------------------------------------------- [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 2.23 GBytes 1.91 Gbits/sec receiver ----------------------------------------------------------- Server listening on 5201 (test #4 vom to vm) ----------------------------------------------------------- [ ID] Interval Transfer Bitrate [ 5] 0.00-10.00 sec 1.97 GBytes 1.69 Gbits/sec receiver -----------------------------------------------------------