[ovs-dev] [PATCH] INSTALL.DPDK.md: Add details of XL710 restrictions for DPDK

Ian Stokes ian.stokes at intel.com
Thu Aug 6 15:58:47 UTC 2015

Currently there are restrictions regarding the use of the XL710 network
interface with OVS and DPDK. This patch details those restrictions in

Signed-off-by: Ian Stokes <ian.stokes at intel.com>
 INSTALL.DPDK.md |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md
index 8563c40..35dd9a0 100644
@@ -720,6 +720,19 @@ Restrictions:
     want to share dpdkr rings with other processes on the host, you can do
     this with smaller page sizes.
+  Platform and Network Interface:
+  - Currently it is not possible to use an Intel XL710 Network Interface as a
+    DPDK port type on a platform with more than 64 logical cores. This is
+    related to how DPDK reports the number of TX queues that may be used by
+    a DPDK application with an XL710. The maximum number of TX queues supported
+    by a DPDK application for an XL710 is 64. If a user attempts to add an
+    XL710 interface as a DPDK port type to a system as described above the
+    port addition will fail as OVS will attempt to initialize a TX queue greater
+    than 64. This issue is expected to be resolved in a future DPDK release.
+    As a workaround a user can disable hyper-threading to reduce the overall
+    core count of the system to be less than or equal to 64 when using an XL710
+    interface with DPDK.
 Bug Reporting:

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