Re: speed difference between using hard-linked and modular drives?

Rusty Russell (rusty@rustcorp.com.au)
Tue, 13 Nov 2001 10:14:22 +1100

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).

Ouch,
Rusty.

--
Premature optmztion is rt of all evl. --DK
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