[ovs-discuss] upgrade ovs kernel module from 2.9 to 2.10, the performance decrease

William Tu u9012063 at gmail.com
Tue Sep 24 18:29:41 UTC 2019


On Mon, Sep 23, 2019 at 4:25 PM Ben Pfaff <blp at ovn.org> wrote:
>
> On Mon, Sep 16, 2019 at 07:51:08PM +0800, djliu wrote:
> > When I upgrade ovs kernel module from 2.9.0 to 2.10.0, then use iperf3 send
> > packets from a vpc vm to a vlan vm, the bandwidth decrease from 3Gbits/sec
> > download to 1Gbits/sec. I
> >
> > reset the commit to the first commit of erspan, then the bandwidth will
> > normal. Also, when the ovs module is 2.9.0, I can capture packet in
> > geneve_sys_6081 port use tcpdump . When upgrade to 2.10.0,

The erspan feature in kernel module shouldn't impact performance if you're
not using it. Do you mind doing a bi-sect to find out which commit degrades the
performance?

> >
> > the tcpdump can't capture any packet in the port. Does anyone know why.

Can you run
'make check-kmod' or 'make check-kernel'
to see whether the geneve testcase passes on your system?

Regards,
William
>
> This is a bit surprising.  Greg, do you have any thoughts about
> potential reasons why the new kernel module would be significantly
> slower?
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