On Mon, 12 Nov 2007, Eric Dumazet wrote:

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> Christoph Lameter a =E9crit :
> > On Mon, 12 Nov 2007, Herbert Xu wrote:
> >=20
> > > David Miller <davem@davemloft.net> wrote:
> > > > Each IP compression tunnel instance does an alloc_percpu().
> > > Actually all IPComp tunnels share one set of objects which are
> > > allocated per-cpu.  So only the first tunnel would do that.
> >=20
> > Ahh so the need to be able to expand per cpu memory storage on demand i=
s not
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> > as critical as we thought.
> >=20
>=20
> Yes, but still desirable for future optimizations.
>=20
> For example, I do think using a per cpu memory storage on net_device refc=
nt &
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> last_rx could give us some speedups.

Note that there was a new patchset posted (titled cpu alloc v1) that=20
provides on demand extension of the cpu areas.

See http://marc.info/?l=3Dlinux-kernel&m=3D119438261304093&w=3D2