On Mon, Feb 13, 2017 at 3:29 PM, Eric Dumazet <eduma...@google.com> wrote: > On Mon, Feb 13, 2017 at 3:26 PM, Alexander Duyck > <alexander.du...@gmail.com> wrote: > >> >> Odds are for a single TCP flow you won't notice. This tends to be >> more of a small packets type performance issue. If you hammer on he >> Rx using pktgen you would be more likely to see it. >> >> Anyway patch looks fine from a functional perspective so I am okay >> with it. The page count bulking is something that can be addressed >> later. > > Well, if we hammer enough, pages are not recycled because we cycle > through RX ring buffer too fast. > > This might be different for PowerPC though, because of its huge PAGE_SIZE.
Actually it depends on the use case. In the case of pktgen packets they are usually dropped pretty early in the receive path. Think something more along the lines of a TCP syn flood versus something that would be loading up a socket. - Alex
