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Turn off MSI-X interrupt migration by default in EC2 instances; this works

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around a bug in older versions of Xen and unbreaks SR-IOV (aka. "EC2
Enhanced Networking").

Approved by:	re (gjb)
Thanks to:	jhb, Jeremiah Lott
This commit is contained in:
Colin Percival 2016-06-24 23:39:44 +00:00
parent 532a0e9ca0
commit 60406292e4
1 changed files with 6 additions and 0 deletions
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6
release/tools/ec2.conf
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@ -77,6 +77,12 @@ vm_extra_pre_umount() {
# by default for now.
echo 'hw.xbd.xbd_enable_indirect="0"' >> ${DESTDIR}/boot/loader.conf
# Some EC2 instances run on a version of Xen which has a bug relating
# to the migration of MSI-X interrupts; this is visible as SR-IOV
# networking (aka. "EC2 Enhanced Networking") not being able to pass
# packets. Disable MSI-X interrupt migration to work around this bug.
echo 'machdep.disable_msix_migration="1"' >> ${DESTDIR}/boot/loader.conf
# The first time the AMI boots, the installed "first boot" scripts
# should be allowed to run:
# * ec2_configinit (download and process EC2 user-data)