On Tue, Sep 25, 2018 at 10:51:05AM +0200, Matteo Croce wrote:
> When using the kernel datapath, OVS allocates a pool of sockets to handle
> netlink events. The number of sockets is: ports * n-handler-threads, where
> n-handler-threads is user configurable and defaults to 3/4*number of cores.
>
> This because vswitchd starts n-handler-threads threads, each one with a
> netlink socket for every port of the switch. Every thread then, starts
> listening on events on its set of sockets with epoll().
>
> On setup with lot of CPUs and ports, the number of sockets easily hits
> the process file descriptor limit, and ovs-vswitchd will exit with -EMFILE.
>
> Change the number of allocated sockets to just one per port by moving
> the socket array from a per handler structure to a per datapath one,
> and let all the handlers share the same sockets by using EPOLLEXCLUSIVE
> epoll flag which avoids duplicate events, on systems that support it.
Applied to master thanks!
I sent a patch to remove support for multiple queues in the
infrastructure layer:
https://patchwork.ozlabs.org/patch/974755/
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