path: root/release/tools/ec2.conf
diff options
authorColin Percival <cperciva@FreeBSD.org>2016-06-29 23:56:24 +0000
committerColin Percival <cperciva@FreeBSD.org>2016-06-29 23:56:24 +0000
commit4d1afa14d53ac496f3fec21e68e902ae678d5143 (patch)
tree9b5a9a57ce6de7356f595fd950b6d26095511acc /release/tools/ec2.conf
parent4b61754c6872686abf6358298c45237146ef0240 (diff)
Enable indirect segment I/Os by default in the Xen blkfront driver when
running on EC2. Due to improvements in EC2, the performance penalty which was present on some EC2 instances no longer exists, and enabling this feature now consistently yields ~20% higher throughput with equal or lower latency. Reverts: r286063 Approved by: re (gjb) MFC after: 2 weeks Relnotes: Improved disk throughput on EC2
Notes: svn path=/head/; revision=302288
Diffstat (limited to 'release/tools/ec2.conf')
1 files changed, 0 insertions, 5 deletions
diff --git a/release/tools/ec2.conf b/release/tools/ec2.conf
index 5f0e868a80eb..d22c9b0290a3 100644
--- a/release/tools/ec2.conf
+++ b/release/tools/ec2.conf
@@ -72,11 +72,6 @@ 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
# 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