On Mon, 2007-08-20 at 14:17 -0700, Christoph Lameter wrote: > On Mon, 20 Aug 2007, Peter Zijlstra wrote: > > > > Its not that different. > > > > Yes it is, disk based completion does not require memory, network based > > completion requires unbounded memory. > > Disk based completion only require no memory if its not on a stack of > other devices and if the interrupt handles is appropriately shaped. If > there are multile levels below or there is some sort of complex > completion handling then this also may require memory. I'm not aware of such a scenario - but it could well be. Still if it would it would take a _bounded_ amount of memory per page. Network would still differ in that it requires an _unbounded_ amount of packets to receive and process in order to receive that completion.
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