Linux kernel network devices in a guest should have the number of
multi-purpose channels configured when used with DPDK multiqueue on the host.
This commit adds an example of how this can be done. Also add QEMU 2.5
requirements for multiqueue with DPDK in NEWS.
Signed-off-by: Ian Stokes <ian.sto...@intel.com>
---
INSTALL.DPDK.md | 17 +++++++++++++++++
NEWS | 2 +-
2 files changed, 18 insertions(+), 1 deletions(-)
diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md
index d892788..e9f9acc 100644
--- a/INSTALL.DPDK.md
+++ b/INSTALL.DPDK.md
@@ -586,6 +586,23 @@ Follow the steps below to attach vhost-user port(s) to a
VM.
-device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2,mq=on,vectors=$v
```
+ Also, the driver in the guest operating system must be configured to use
+ the exact same number of queues. If the number of queues is less than $q,
+ then packets that are enqueued to queues unused by guest will not be
+ received.
+
+ This can be done for the Linux kernel virtio-net driver with:
+
+ ```
+ ethtool -L <DEV> combined <$q>
+ ```
+
+ A note on the command above:
+
+ `-L`: Changes the numbers of channels of the specified network device
+
+ `combined`: Changes the number of multi-purpose channels.
+
DPDK vhost-cuse:
----------------
diff --git a/NEWS b/NEWS
index 3e33871..2d1b8fb 100644
--- a/NEWS
+++ b/NEWS
@@ -55,7 +55,7 @@ v2.5.0 - xx xxx xxxx
- DPDK:
* Requires DPDK 2.2
* Added multiqueue support to vhost-user
-
+ * Note: QEMU 2.5+ required for multiqueue support
v2.4.0 - 20 Aug 2015
---------------------
--
1.7.4.1
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