Messages in this thread | | | Date | Mon, 12 Nov 2001 17:30:14 -0800 | From | Mike Fedyk <> | Subject | Re: speed difference between using hard-linked and modular drives? |
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On Tue, Nov 13, 2001 at 10:14:22AM +1100, Rusty Russell wrote: > In message <20011112.152304.39155908.davem@redhat.com> you write: > > From: Rusty Russell <rusty@rustcorp.com.au> > > Date: Mon, 12 Nov 2001 20:59:05 +1100 > > > > (atomic_inc & atomic_dec_and_test for every packet, anyone?). > > > > We already do pay that price, in skb_release_data() :-) > > Sorry, I wasn't clear! skb_release_data() does an atomic ops on the > skb data region, which is almost certainly on the same CPU. This is > an atomic op on a global counter for the module, which almost > certainly isn't. > > For something which (statistically speaking) never happens (module > unload). >
Is this in the fast path or slow path?
If it only happens on (un)load, then there isn't any cost until it's needed...
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