There's a bug in kernels before Linux 5.0 that affects NFS 4.1 connections. The bug presents itself like this:
* On NFS clients: Attempts to access mounted NFS shares associated with the affected server
block indefinitely.
* On the network: A storm of repeated RPCs between NFS client and server uses a lot
of bandwidth. Each RPC is acknoledged by the server with an NFS4ERR_SEQ_MISORDERED error.
* Other NFS clients connected to the same NFS server: Performance drops dramatically.
There's a bug in kernels before Linux 5.0 that affects NFS 4.1 connections. The bug presents itself like this: SEQ_MISORDERED error.
* On NFS clients: Attempts to access mounted NFS shares associated with the affected server
block indefinitely.
* On the network: A storm of repeated RPCs between NFS client and server uses a lot
of bandwidth. Each RPC is acknoledged by the server with an NFS4ERR_
* Other NFS clients connected to the same NFS server: Performance drops dramatically.
A patch is available to fix this problem:
<https:/ /git.kernel. org/pub/ scm/linux/ kernel/ git/torvalds/ linux.git/ commit/ ?id=3453d5708b3 3efe76f40eca1c0 ed60923094b971>
Is is possible to integrate the patch into the 4.18 kernel series?
I'm using Ubuntu 18.04.2 LTS as NFS client an server.
Thank you.
Best regards,
Frank Burkhardt