[ovs-dev] [PATCH v4] ofproto-dpif-xlate: Implement RCU locking in ofproto-dpif-xlate.

Gurucharan Shetty shettyg at nicira.com
Mon May 19 16:12:31 UTC 2014

On Mon, May 19, 2014 at 8:56 AM, Ben Pfaff <blp at nicira.com> wrote:
> On Fri, May 16, 2014 at 06:59:02AM -0700, Ryan Wilson wrote:
>> Before, a global read-write lock protected the ofproto-dpif / ofproto-dpif-xlate
>> interface. Handler and revalidator threads had to wait while configuration was
>> being changed. This patch implements RCU locking which allows handlers and
>> revalidators to operate while configuration is being updated.
>> Signed-off-by: Ryan Wilson <wryan at nicira.com>
>> Acked-by: Alex Wang <alexw at nicira.com>
> One side effect of this change that I am a bit concerned about is
> performance of configuration changes.  In particular, it looks like
> removing a port requires copying the entire configuration and that
> removing N ports requires copying the entire configuration N times.  Can
> you try a few experiments with configurations that have many ports,
> maybe 500 or 1000, and see how long it takes to remove several of them?

While doing this experiment, can you also do a
"/etc/init.d/openvswitch[-switch] force-reload-kmod" and see if it
takes additional time?
We use the above during upgrade.
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