On Tue, 2019-06-11 at 08:08 +0200, Christoph Hellwig wrote: > On Tue, Jun 11, 2019 at 03:56:33PM +1000, Benjamin Herrenschmidt > wrote: > > The reason I think it sort-of-mostly-worked is that to get more > > than > > 1GB of RAM, those machines use CONFIG_HIGHMEM. And *most* network > > buffers aren't allocated in Highmem.... so you got lucky. > > > > That said, there is such as thing as no-copy send on network, so I > > wouldn't be surprised if some things would still have failed, just > > not > > frequent enough for you to notice. > > Unless NETIF_F_HIGHDMA is set on a netdev, the core networkign code > will bounce buffer highmem pages for the driver under all > circumstances. ... which b43legacy doesn't set to the best of my knowledge ... Which makes me wonder how come it didn't work even with your patches ? AFAIK, we have less than 1GB of lowmem unless the config has been tweaked.... Cheers, Ben.
