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| author | cperciva <cperciva@FreeBSD.org> | 2015-09-14 19:37:51 +0000 |
|---|---|---|
| committer | cperciva <cperciva@FreeBSD.org> | 2015-09-14 19:37:51 +0000 |
| commit | a6f66e44deebac6adc1fdb2f3abb6f0afbbc38de (patch) | |
| tree | f225645db73507994845c99aef9978dee87bd2cc /release | |
| parent | 7def3b237569e524815cdc74b0ce136b0a96b87e (diff) | |
| download | FreeBSD-src-a6f66e44deebac6adc1fdb2f3abb6f0afbbc38de.zip FreeBSD-src-a6f66e44deebac6adc1fdb2f3abb6f0afbbc38de.tar.gz | |
MFC r286062, r286063
Add support to blkfront for blkif indirect segment I/Os.
Turn this support off by default in EC2 builds due to performance issues
on some EC2 instance types.
Diffstat (limited to 'release')
| -rw-r--r-- | release/tools/ec2.conf | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/release/tools/ec2.conf b/release/tools/ec2.conf index 9472ec5..557e602 100644 --- a/release/tools/ec2.conf +++ b/release/tools/ec2.conf @@ -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) |
