On Thu, 17 May 2018 16:22:37 -0600 dsah...@kernel.org wrote: > From: David Ahern <dsah...@gmail.com> > > Using iproute2 to create a bridge and add 4094 vlans to it can take from > 2 to 3 *minutes*. The reason is the extraneous call to ll_name_to_index. > ll_name_to_index results in an ioctl(SIOCGIFINDEX) call which in turn > invokes dev_load. If the index does not exist, which it won't when > creating a new link, dev_load calls modprobe twice -- once for > netdev-NAME and again for NAME. This is unnecessary overhead for each > link create. > > When ip link is invoked for a new device, there is no reason to > call ll_name_to_index for the new device. With this patch, creating > a bridge and adding 4094 vlans takes less than 3 *seconds*. > > Signed-off-by: David Ahern <dsah...@gmail.com>
Yes this looks like a real problem. Isn't the cache supposed to reduce this? Don't like to make lots of special case flags.
