mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-08-30 13:58:14 +00:00
Code Issues Releases Wiki Activity

FAQ, NEWS: Notes on TCP flags matching.

Browse Source 
Add a FAQ categorry "Performance Problems".  So far the only entry
addresses the issue with using a new kernel module with an older
(pre-megaflows) userspace.
This commit is contained in:
Jarno Rajahalme 2013-11-13 11:19:56 -08:00
parent 1e6fbba05e
commit bcb8bde4ca
2 changed files with 26 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
FAQ
View File

@ -468,6 +468,27 @@ A: Open vSwitch uses different kinds of flows for different purposes:
regardless of the type. regardless of the type.
Performance
-----------
Q: I just upgraded and I see a performance drop. Why?
A: The OVS kernel datapath may have been updated to a newer version than
the OVS userspace components. Sometimes new versions of OVS kernel
module add functionality that is backwards compatible with older
userspace components but may cause a drop in performance with them.
Especially, if a kernel module from OVS 2.1 or newer is paired with
OVS userspace 1.10 or older, there will be a performance drop for
TCP traffic.
Updating the OVS userspace components to the latest released
version should fix the performance degradation.
To get the best possible performance and functionality, it is
recommended to pair the same versions of the kernel module and OVS
userspace.
Configuration Problems Configuration Problems
---------------------- ----------------------

5
NEWS
View File

@ -1,5 +1,10 @@
Post-v2.0.0 Post-v2.0.0
--------------------- ---------------------
- TCP flags matching: OVS now supports matching of TCP flags. This
has an adverse performance impact when using OVS userspace 1.10
or older (no megaflows support) together with the new OVS kernel
module. It is recommended that the kernel and userspace modules
both are upgraded at the same time.
- The default OpenFlow and OVSDB ports will change to - The default OpenFlow and OVSDB ports will change to
IANA-assigned numbers in a future release. Consider updating IANA-assigned numbers in a future release. Consider updating
your installations to specify port numbers instead of using the your installations to specify port numbers instead of using the