On Mon, 2022-11-14 at 13:21 +0100, hw wrote: > On Mon, 2022-11-14 at 12:28 +0100, stefano gozzi wrote: > > Please loot at this: > > https://www.linuxquestions.org/questions/linux-networking-3/intel-x540-t2-network-card-installed-but-only-at-100mbit-cant-change-or-improve-4175686736/ > > > > It seems that you need a 8x pcie slot to work fine > > Thanks, the card is in an 8x slot and has been working fine with Fedora. I > didn't change anything but using Debian instead of Fedora.
Ok I pulled the server from the rack and put another fan to blow directly on the card in case it might overheat. And I have to correct myself. The card is in an 8x slot and according to the manual of the mainboard it's supposed to be 8x and not 4x. I pulled it and put it back in. However, lspci says "LnkSta: Speed 5GT/s (ok), Width x4 (downgraded)". Usually cards in PCI slots with 4 instead of 8 lanes still work fine, and the card did work in that slot with Fedora. I found that I had to unplug the network cable and to plug it back in before I could send/receive pings. I already tried a different network cable and it didn't make a difference. I suspect that Debian might be doing something differently or not doing that Fedora does which causes the intermittent connections. Any ideas? Backups over an 1GB link are excruciatingly slow ...
