https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207446
Bug ID: 207446
Summary: Hang bringing up vtnet(4) on >8 cpu GCE VMs
Product: Base System
Version: 10.3-BETA2
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
Created attachment 167336
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=167336&action=edit
patch to sys/dev/virtio/network/if_vtnetvar.h
FreeBSD on Google Compute Engine currently requires "hw.vtnet.mq_disable=1" on
virtual machines of more than 8 CPUs to avoid a hang when bringing up the vtnet
interface.
I have prepared a patch which raises the VTNET_MAX_QUEUE_PAIRS to 64 which
solves this hang on GCE VMs with 64 or fewer CPUs.
With this patch, the release engineer should be able to remove the
hw.vtnet.mq_disable line from the /boot/loader.conf that is placed in images
intended for Google Compute Engine and users should see the benefits of
multiqueue as a result.
The current limit of 8 is in CURRENT as well as earlier release branches (e.g.
stable/10).
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