[ovs-discuss] Disable EMC/Microflow Cache in OVS Kernel Datapath

Ben Pfaff blp at ovn.org
Fri Jan 31 17:51:27 UTC 2020

On Fri, Jan 24, 2020 at 12:38:57PM +0800, Vipul Ujawane wrote:
> I am running OVS with kernel data path, and I was wondering whether it is
> possible to switch the EMC/Microflow cache off (as it is possible with DPDK
> data path). I was testing the performance of OVS and I tried one installed
> from my linux distro's repository (debian 10/ubuntu 18.04) and one built
> from source. As far as I know (according to a megaflow cache degradation
> talk recently appeared at OVS Con), the OVS kernel module coming from the
> repository has the EMC switched off/not compiled(?). I would like to
> confirm whether this is the only reason of the performance difference I
> measured, but I would need to switch off the EMC manually.

I don't think that the kernel module has that feature.  I think that you
would need to modify and recompile it.

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