[dpdk-dev] [PATCH] doc: add note for MAX QUEUES macro in vhost sample
Xiao Wang
xiao.w.wang at intel.com
Thu May 24 08:11:15 CEST 2018
If the NIC has a queue number larger than 128, then we need to change
the ``MAX_QUEUES`` to a larger number to make sure we allocate a big
enough memory pool for device setup.
Signed-off-by: Xiao Wang <xiao.w.wang at intel.com>
---
doc/guides/sample_app_ug/vhost.rst | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/doc/guides/sample_app_ug/vhost.rst b/doc/guides/sample_app_ug/vhost.rst
index 5e7f24c4e..88905e404 100644
--- a/doc/guides/sample_app_ug/vhost.rst
+++ b/doc/guides/sample_app_ug/vhost.rst
@@ -181,3 +181,13 @@ Common Issues
* Failed to build DPDK in VM
Make sure "-cpu host" QEMU option is given.
+
+* Device start fails if NIC's max queues > the default number of 128
+
+ mbuf pool size is dependent on the MAX_QUEUES configuration, if NIC's
+ max queue number is larger than 128, device start will fail due to
+ insufficient mbuf.
+
+ Change the default number to make it work as below, just set the number
+ according to the NIC's property.
+ make EXTRA_CFLAGS="-DMAX_QUEUES=320"
--
2.15.1
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