datapath: Clear rxhash when using an action that may affect it

[openvswitch] / INSTALL.Linux

diff --git a/INSTALL.Linux b/INSTALL.Linux
index e950c05197b868ee69fa02ec2796c6f490ce0b43..f80e1c645fec5b30c5d438dd1df7a8c02f7529ae 100644 (file)
--- a/INSTALL.Linux
+++ b/INSTALL.Linux
@@ -227,6 +227,17 @@ Prerequisites section, follow the procedure below to build.
         module loading, please include the output from the "dmesg" and
         "modinfo" commands mentioned above.
 
         module loading, please include the output from the "dmesg" and
         "modinfo" commands mentioned above.
 

+   There is an optional module parameter to openvswitch_mod.ko called
+   vlan_tso that enables TCP segmentation offload over VLANs on NICs
+   that support it. Many drivers do not expose support for TSO on VLANs
+   in a way that Open vSwitch can use but there is no way to detect
+   whether this is the case. If you know that your particular driver can
+   handle it (for example by testing sending large TCP packets over VLANs)
+   then passing in a value of 1 may improve performance. Modules built for
+   Linux kernels 2.6.37 and later do not need this and do not have this
+   parameter. If you do not understand what this means or do not know if
+   your driver will work, do not set this.
+

 7. Initialize the configuration database using ovsdb-tool, e.g.:
 
       % ovsdb-tool create /usr/local/etc/ovs-vswitchd.conf.db vswitchd/vswitch.ovsschema
 7. Initialize the configuration database using ovsdb-tool, e.g.:
 
       % ovsdb-tool create /usr/local/etc/ovs-vswitchd.conf.db vswitchd/vswitch.ovsschema