Red Hat Bugzilla – Bug 1267044
Ethernet network slow / TCP retransmits / Large frames [module: e1000e]
Last modified: 2015-09-29 17:00:39 EDT
Description of problem:
I'm having severe network performance problems when copying files to an Intel NUC with an "Intel Corporation Ethernet Connection (3) I218-V (rev 03)" Ethernet controller. When copying files to this node ("node a"), the remote side ("node b") decides to send large frames and the node rejects them, leading to inane amounts of retransmits. When copying files from node A to node B, node A also sends large frames, but node B accepts them.
I'm seeing the problem with different B nodes which are connected by switches (I have tried two different switches). When node B is connected through a router, the frame size apparently stays small and the problem doesn't trigger.
The MTU side on both sides is set to the standard 1500 bytes.
Version-Release number of selected component (if applicable):
Fedora 23 Beta 1
Huge amounts of retransmits, abysmal network performance.
No retransmits, normal network performance.
Created attachment 1078085 [details]
Traffic from the problematic node A
Weird, I cannot reproduce the bug anymore, and I'm not sure what made it go away. I'm closing this bug for now.