Author: cperciva
Date: Fri Jun 24 23:39:44 2016
New Revision: 302184
URL: https://svnweb.freebsd.org/changeset/base/302184
Log:
Turn off MSI-X interrupt migration by default in EC2 instances; this works
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
Modified:
head/release/tools/ec2.conf
Modified: head/release/tools/ec2.conf
==============================================================================
--- head/release/tools/ec2.conf Fri Jun 24 23:36:22 2016 (r302183)
+++ head/release/tools/ec2.conf Fri Jun 24 23:39:44 2016 (r302184)
@@ -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)
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