[Bug 231117] I/O lockups inside bhyve vms

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231117

punkt.de Hosting Team <mops at punkt.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mops at punkt.de

--- Comment #2 from punkt.de Hosting Team <mops at punkt.de> ---
Hi Niels,

being more of an operator than a developer I don't have any insight into the
root cause of this, but we run a ton of jails and a couple of bhyve VMs on
FreeBSD in production and we found that

* The automatic adjustment of ARC size under memory pressure is still not
working perfectly.
* It helps to statically limit the ARC size (vfs.zfs.arc_max) on the host
system - we use a quarter of physical memory, so VMs have some breathing room.
* I would definitely limit the ARC size inside each VM
* Are you running the virtual disks as AHCI or virtio? We use virtio
throughout.

HTH
Patrick

-- 
You are receiving this mail because:
You are the assignee for the bug.