bjornatic Posted December 14, 2020 Share Posted December 14, 2020 (edited) Hello ! I'll try to keep it short : Fresh BigSur install (with Macinabox) on a 256Gb Samsung 980 PRO with the controller passed through. The drive is on now on a PCIe Gen 4 socket but it may important to note that it was (my mistake) on a GEN3 socket during the install. So before I moved it to the right socket, "System Report" reported : Link width : 4x / Link Speed 8GT/s (so GEN 3). Now, it's on the right socket, the lspci command gives : LnkSta: Speed 16GT/s (ok), Width x4 (ok) BUT, and this is the problem I can't find a solution / explanation for : under System Report, Link Width is still 4x but there is no info for Link Speed... A Blackmagicdesign Disk Speed test shows a read speed of 2.8GB/s (so the same as on GEN3) where the drive is theoretically capable of 7GB/s. And I know I wont get that speed, but now I'm having less than half. Other details : The same drive passed through (controller) to a windows VM is on a GEN4 link. So all good on this side. Motherboard is Asus TUF Gaming X570. Latest bios. The XML part for the controller : <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x04' slot='0x00' function='0x0'/> </source> <alias name='hostdev0'/> <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/> </hostdev> I even tried to move from Q35-4.2 to 5.1, but nothing changed. My fear is that it's because I swapped socket after the install... And that the solution would be a new install... But maybe one of you will have a better suggestion ! Thanks for your attention. Edited May 22, 2021 by bjornatic Quote Link to comment
bjornatic Posted December 15, 2020 Author Share Posted December 15, 2020 (edited) GNIIiiiiiiiiiiiiiii !! This is me trying to push up this topic. ^^ Edited December 15, 2020 by bjornatic Quote Link to comment
giganode Posted December 19, 2020 Share Posted December 19, 2020 Do you use an nvme.kext? Quote Link to comment
bjornatic Posted December 20, 2020 Author Share Posted December 20, 2020 I use the Nvmefix kext but no other (regarding Nvme). The controller used for the 980 Pro is new (and called Elpis) and i just assumed that i have to wait for a driver / kext update. I was not able to find any one else having this problem with this specific drive. Quote Link to comment
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