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doc: add note for maximum queues setting in vhost sample

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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@intel.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Marko Kovacevic <marko.kovacevic@intel.com>
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Xiao Wang 2018-05-24 20:05:07 +08:00 committed by Ferruh Yigit
parent f42deafa44
commit cde83b8bd7
1 changed files with 11 additions and 0 deletions
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doc/guides/sample_app_ug/vhost.rst
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@ -181,3 +181,14 @@ 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"