On 27/06/2024 19:47, cjohn...@serranosystems.com wrote:

Hi Marcus,

Anyone else able to look at this with ability to Tx on x310?

I have looked at all the counters on the server, and it I don’t see anything unusual. Let me know if you need me to up/down the interface (to reset) and provide you some counters….

Here is more info:

|~$ sudo ethtool -i eno2 driver: ixgbe version: 5.19.0-1010-nvidia-lowlatency firmware-version: 0x80001743, 1.3082.0 expansion-rom-version: bus-info: 0000:04:00.1 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes supports-priv-flags: yes ~$ lspci -v -s 000:04:00.1 04:00.1 Ethernet controller: Intel Corporation Ethernet Controller 10G X550T (rev 01) DeviceName: Intel Ethernet X550 #2 Subsystem: Super Micro Computer Inc Ethernet Controller 10G X550T Flags: bus master, fast devsel, latency 0, IRQ 16, NUMA node 0 Memory at 200fff400000 (64-bit, prefetchable) [size=4M] Memory at 200fffc00000 (64-bit, prefetchable) [size=16K] Expansion ROM at 9a100000 [disabled] [size=512K] Capabilities: <access denied> Kernel driver in use: ixgbe Kernel modules: ixgbe |

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You haven't specified a timeout on your "send()" calls, so it defaults to 0.1 seconds.  Which on the *first* send is   inadequate, which is why there's that "timeout" calculation -- to account for the fact that the call will block until   your desired send time.  So, I don't know what happens in this case, whether data still gets thrown into kernel
  buffers, or what.



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