On Wed, 2016-12-07 at 18:37 +0100, Hannes Frederic Sowa wrote: > I had the same idea while discussing that with Paolo, merely using an > *atomic_t = kmalloc(sizeof(atomic_t)) out of band of the socket. > > My fear was that those could be aggregated by the slab cache into one > cache line, causing even more heating on cachelines.
My exact idea was to let up to 4095 (or PAGE_SIZE - 1) increments being done on the counter before switching to dynamically allocated memory. ( Some packets might be dropped by TCP sockets, not necessarily a sign of an attack. just some spurious retransmits )
