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 - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
