[pve-devel] proxmox6 : vhost_net experimental_zcopytx=1 bug?

Alexandre DERUMIER aderumier at odiso.com
Tue Aug 20 11:32:57 CEST 2019


Hi,

Some users have reported vm start timeout on proxmox6

https://forum.proxmox.com/threads/vm-doesnt-start-proxmox-6-timeout-waiting-on-systemd.56218/

and for at least 2 of them,

the vhost_net module option experimental_zcopytx=0 have fixed it.

It was enable by default since 2012, so maybe regression somewhere. (also redhat disable it by default)


It seem than in kernel 5.1, the value has been rollback to 0
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.2.9&id=9d28094f3cf3b315e784f04ba617de8c8d8978fa 

Not sure if this patch could be backported in proxmox 5.0 kernel ?





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