bad 2.5g nic performance

High_bounce

hi guys, i am currently having horrible performance on 23.01 beta with an intel 2.5Gbe maxing at around 400Mbps and if i roll back to 22.05 i can get 1100Mbps with my current internet. any help would be appreciated

stephenw10

Is it linking at 2.5G?

Do you see errors on the interface?

High_bounce

"arpresolve: can't allocate llinfo on igc0" about 100+ of that message in the logs i don't see anything else in my poking around but if you let me know where to look ill take a peek

stephenw10

Those messages would not be generated by something that affects throughput directly. They imply the igc0 NIC lost its IP address.
Check Status > Interfaces.

High_bounce

23.01:

In/out packets
30640458/27751396 (35.34 GiB/10.29 GiB)
In/out packets (pass)
30640458/27751396 (35.34 GiB/10.29 GiB)
In/out packets (block)
768457/0 (27.98 MiB/0 B)
In/out errors
0/0
Collisions
0
Interrupts
25133274 (2093/s)

22.05:

In/out packets
1325699/1303734 (1.83 GiB/53.02 MiB)
In/out packets (pass)
1325699/1303734 (1.83 GiB/53.02 MiB)
In/out packets (block)
2530/0 (254 KiB/0 B)
In/out errors
0/0
Collisions
0
Interrupts
452637 (5007/s)

doesnt seem like it but very consistent to test rolling back to 22.05

stephenw10

And in both cases it's correctly linked at 2.5G?

Check the off-loading options enabled in each case. Try running ifconfig -vvvm igc0.

Check the boot logs, is it attaching with the same number of queues?
Like:

igc0: <Intel(R) Ethernet Controller I225-V> mem 0x81300000-0x813fffff,0x81400000-0x81403fff at device 0.0 on pci4
igc0: Using 1024 TX descriptors and 1024 RX descriptors
igc0: Using 2 RX queues 2 TX queues
igc0: Using MSI-X interrupts with 3 vectors
igc0: Ethernet address: 90:ec:77:1f:8c:3f
igc0: netmap queues/slots: TX 2/1024, RX 2/1024

Steve

High_bounce

i can confirm that both are the same between 220.5 and 23.01 only difference between yours and mine is RX/TX queues are 4 instead of 2 in yours and MSI-X Interrupts with 5 vectors instead of 3 with yours

stephenw10

Mmm, that's expected on a 4 core system. My output was from a 4100.

You might check the CPU usage in top -HaSP from each system to see if anything is significantly different.

Steve

High_bounce

after doing some testing and switching of nics i no longer believe it is related to the 2.5gbe interface. i ripped a chelsio t520 from a server for a minute and threw it in and it gave me the exact same problem. peeks around 400-450Mbps in speed test running 23.01 and 950-1100Mbps with 22.05. i am sorry i led you down the wrong path. thank you for all your help!