On Fri, Aug 04, 2006 at 03:59:37PM +1000, Herbert Xu ([email protected]) wrote:
> Chris Leech <[email protected]> wrote:
> >
> > We could try and only use page allocations for older e1000 devices,
> > putting headers and payload into skb->frags and copying the headers
> > out into the skb->data area as needed for processing. That would do
> > away with large allocations, but in Jesse's experiments calling
> > alloc_page() is slower than kmalloc(), so there can actually be a
> > performance hit from trying to use page allocations all the time.
>
> Interesting. Could you guys post figures on alloc_page speed vs. kmalloc?
They probalby measured kmalloc cache access, which only falls to
alloc_pages when cache is refilled, so it will be faster for some short
period of time, but in general (especially for such big-sized
allocations) it is essencially the same.
> Also, getting memory slower is better than not getting them at all :)
Sure.
> --
> Visit Openswan at http://www.openswan.org/
> Email: Herbert Xu ~{PmV>HI~} <[email protected]>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
Evgeniy Polyakov
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