[ovs-dev] [PATCH v2] INSTALL.DPDK: Mention issue with QEMU v2.4.0 & dpdkvhostuser

Daniele Di Proietto diproiettod at vmware.com
Sat Nov 7 00:06:29 UTC 2015


I applied this to master, thanks.

We should remember to remove this when we move to DPDK 2.2

On 05/11/2015 03:14, "Ciara Loftus" <ciara.loftus at intel.com> wrote:

>Currently when using QEMU v2.4.0+, two (or more) dpdkvhostuser ports
>cannot
>be unbound from the kernel driver in the guest without causing the
>ovs-vswitchd process to crash. Document this limitation and potential
>workarounds.
>
>Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
>---
> INSTALL.DPDK.md | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
>diff --git a/INSTALL.DPDK.md b/INSTALL.DPDK.md
>index 02588c4..96b686c 100644
>--- a/INSTALL.DPDK.md
>+++ b/INSTALL.DPDK.md
>@@ -891,6 +891,18 @@ Restrictions:
>     core count of the system to be less than or equal to 64 when using
>an XL710
>     interface with DPDK.
> 
>+  vHost and QEMU v2.4.0+:
>+  - For versions of QEMU v2.4.0 and later, it is currently not possible
>to
>+    unbind more than one dpdkvhostuser port from the guest kernel driver
>+    without causing the ovs-vswitchd process to crash. If this is a
>requirement
>+    for your use case, it is recommended either to use a version of QEMU
>+    between v2.2.0 and v2.3.1 (inclusive), or alternatively, to apply the
>+    following patch to DPDK and rebuild:
>+    
>https://urldefense.proofpoint.com/v2/url?u=http-3A__dpdk.org_dev_patchwork
>_patch_7736_&d=BQIGaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=SmB5
>nZacmXNq0gKCC1s_Cw5yUNjxgD4v5kJqZ2uWLlE&m=079UWIQfNZfFOiT1740c-D8BfVd8i013
>V-oxENZbxPY&s=1v4hVQpJqDFudC3HJ8roD6mOq2TTA9nMGnw5DJUEy9A&e=
>+    This problem will likely be resolved in Open vSwitch at a later
>date, when
>+    the next release of DPDK (which includes the above patch) is
>available and
>+    integrated into OVS.
>+
> Bug Reporting:
> --------------
> 
>-- 
>1.9.3
>
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