On Wed, 2008-11-19 at 14:24 +0200, Tomas Winkler wrote: > On Wed, Nov 19, 2008 at 1:40 PM, Johannes Berg > <johannes@xxxxxxxxxxxxxxxx> wrote: > > On Wed, 2008-11-19 at 11:21 +0200, Tomas Winkler wrote: > > > >> > Indeed. One would seem to be the buffer list itself, which also needs to > >> > fit within a 40-bit mask with 256 alignment (rxq->bd), the rb_stts needs > >> > 16-byte alignment which probably is always satisfied, but I'm not sure, > >> > you'll need to research the alignment guarantees. > >> > >> Note these are allocated using persistent calls and not kmalloc I hope > >> at least does are page alignment. > > > > Good point. On powerpc at least that uses alloc_pages internally. > > Not sure if if wouldn't be better just work directly with pages in RX? Well, in theory yes, but it's not possible to have skb->data point to a separate page rather than a kmalloc area. And while you could allocate an skb with very little headroom and the rest of the skb data in the fraglist with pages, mac80211 couldn't handle it. johannes
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