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Disable blkif indirect segment I/Os in EC2 by default due to performance

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issues on some EC2 instance types.  Users may want to experiment with
removing this from loader.conf and measuring the performance impact on
the EC2 instances they are using.
This commit is contained in:
Colin Percival 2015-07-30 04:01:00 +00:00
parent aaebf69062
commit a5c1653b5c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=286063
1 changed files with 5 additions and 0 deletions
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release/tools/ec2.conf
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@ -70,6 +70,11 @@ vm_extra_pre_umount() {
# nodes, but apply the workaround just in case.
echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf
# Some EC2 instances suffer a significant (~40%) reduction in
# throughput when using blkif indirect segment I/Os. Disable this
# by default for now.
echo 'hw.xbd.xbd_enable_indirect="0"' >> ${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)