Challenge of 40-Gigabit Fiber Transmission
Challenge of 40-Gigabit Fiber Transmission
Thank you for your thorough response. It's been challenging to locate solutions since few people use 40-gigabit ethernet at home. When I turned off Flow Control, the speed became unstable and didn't noticeably improved. Disabling QoS certainly helped, and even after trying all your suggestions, I'm still around 25 Gbps. It seems Windows Copy might be the issue. Could you clarify what offloads are? Are they shifting more work to the NIC instead of the CPU, or is there another way I misunderstood? My 16-core 3950X processor is powerful enough for transfers, so everything should be running smoothly. Just want to ensure everything is operating correctly. P.S.: I noticed my speed fell several gigabits below 25 Gbps after a Windows update—it took me days to realize it reset all my NIC settings back to defaults.
You performed a multi-threaded copy of your 40GB and 20GB files using a 32-thread approach, resulting in a speed of about 25.85 Gbps. This is noticeably quicker than the 13-18 Gbps you're currently experiencing with Windows file copying.