On Sun, Aug 13, 2006 at 05:42:47PM -0700, Daniel Phillips (phillips@google.com) wrote:

High order allocations are just way too undependable without active
defragmentation, which isn't even on the horizon at the moment.  We
just need to treat any network hardware that can't scatter/gather into
single pages as too broken to use for network block io.

A bit of network tree allocator free advertisement - per-CPU self 
defragmentation works reliably in that allocator, one could even find a
graphs of memory usage for NTA and SLAB-like allocator.

As for sk_buff cow break, we need to look at which network paths do it
(netfilter obviously, probably others) and decide whether we just want
to declare that the feature breaks network block IO, or fix the feature
so it plays well with reserve accounting.

I would suggest to consider skb cow (cloning) as a must.

Regards,

Daniel

-- 
	Evgeniy Polyakov