razor Posted April 7, 2019 Share Posted April 7, 2019 I am trying to replace my desktop by putting my 1080 ti and my western digital black nvme into my X9DRi-LN4F+ system. I have dual 2680v2 and I am getting terrible nvme performance when running a crystalDiskMark benchmark. 272 MB/s write compared to almost 3,000 MB/s write when native in my desktop. Is this an issue with my motherboard or the passthrough? I have both the video card and the nvme on CPU1 PCI-e x16 3.0 slots. I have also tried the CPU2 slots. I have the CPU isolated and pinned to that VM. does anyone have any suggestions? -Thanks Quote Link to comment
Nephilgrim Posted April 19, 2019 Share Posted April 19, 2019 lspci -s 00:00.0 -vv | grep Lnk Change 00:00.0 to the one that matches your device. In that motherboard should be 84:00.0 , 83, and 82 for the cpu2 PCIe's and see what link speed is detected by unraid. Example, my GTX 1070: # lspci -s 84:00.0 -vv | grep Lnk LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <512ns, L1 <16us LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ LnkSta: Speed 2.5GT/s (downgraded), Width x16 (ok) LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis- LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+, EqualizationPhase1+ Speed appears as downgraded since it's not currently being used by the system. If i do the same when a game is running it will get the 8GT/s speed. Try that both with your card and the nvme disk to see if the pci bandwith is correctly detected. If not maybe something in bios is not ok. Example for a usb3.0 pcie card i have in the 1x slot of the cpu2: lspci -s 82:00.0 -vv | grep Lnk LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <4us, L1 unlimited LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ LnkSta: Speed 5GT/s (ok), Width x1 (ok) LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis- LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1- Quote Link to comment
razor Posted April 19, 2019 Author Share Posted April 19, 2019 Thanks. I'll give it a shot after this weekend and report back Quote Link to comment
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