Re: Avoiding external fragmentation with a placement policy Version12

[Nick Piggin]

Herbert Xu wrote:
> Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
>
> > network code. If the latter, that would suggest at least in theory
> > it could use noncongiguous physical pages.
>
>
> With Dave's latest super-TSO patch, TCP over loopback will only be
> doing order-0 allocations in the common case.  UDP and others may
> still do large allocations but that logic is all localised in
> ip_append_data.
>
> So if we wanted we could easily remove most large allocations over
> the loopback device.

I would be very interested to look into that. I would be
willing to do benchmarks on a range of machines too if
that would be of any use to you.

Thanks,
Nick

--
SUSE Labs, Novell Inc.
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