https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216425
Bug ID: 216425
Summary: When transfer large files, NFS hangs when VM network
card is if_vmx or if_vxn, ok for e1000
Product: Base System
Version: 11.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-b...@freebsd.org
Reporter: patrick_...@yahoo.com.hk
CC: freebsd-amd64@FreeBSD.org
CC: freebsd-amd64@FreeBSD.org
Setup: FreeBSD VM guest as NFS server. The physical host running VMware
workstation.
FreeBSD version: FreeBSD 11.0-STABLE #0 r309850: Sun Dec 11 19:30:14
One disk is ZFS, de-duplication and compression is enabled for the ZFS dataset.
It is shared out for NFS to another client (The host is Linux)
When the NIC setting of the VM is vmxnet3 (if_vmx) or vmxnet (if_vxn):
After the client had mount the NFS, the client side would hang if there are
large file operations such as 'dd if=/dev/zero of=/nfs_mount_point/file bs=100M
count=1' or copy large files to the NFS mount point.
When it had problem. The CPU usage in FreeBSD is normal. There would be serious
packet loss for all the NICs in the FreeBSD VM guest. Besides packet loss, for
the other NFS Linux clients, they will see these error message:
[ 5843.755544] nfs: server FreeBSD_SERVER_IP not responding, timed out
After changing the emulated ethernet card to e1000. It is fine but the speed is
slower (10 gigabit vs 1 gigabit).
I have tested with other Linux guests, they do not have such problem.
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