Re: [bisected] e341694e3eb5 netlink_lookup() rcu conversion causes latencies

From: David Miller
Date: Sat Oct 11 2014 - 19:08:37 EST

From: Thomas Graf <tgraf@xxxxxxx>
Date: Sat, 11 Oct 2014 23:25:14 +0100

> I think the issue here is obvious and a fix is on the way to move
> the insertion and removal to a worker to no longer require the
> synchronize_rcu().
> What bothers me is that the synchronize_rcu() should only occur
> on expand/shrink and not for every table update. The default table
> size is 64.

Not true, every netlink socket release incurs a synchronize_net()
now, because we added such a call to netlink_release().

I specifically brought this up to as a possible problem when the
changes went in...
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at