On Thu, 2017-01-19 at 12:55 +0200, Roman Yeryomin wrote: > On 17 January 2017 at 21:20, Eric Dumazet <eric.duma...@gmail.com> wrote:
> > Note that at 100M, 64 rx descriptors have a 8 ms max latency. > > > > Switching to 256 also multiply by 4 the latency -> 32 ms latency. > > > > Presumably switching to NAPI and GRO would avoid the latency increase > > and save a lot of cpu cycles for a MIPS board. > > > > Eric, thanks for suggesting GRO, it gives huge performance gain when > receiving locally (55->95Mbps) and more than 25% gain for NAT > (55->70Mbps). > Also reading the datasheet more carefully I see that device rx > descriptor status flags are interpreted incorrectly. So will provide > an updated set. Oh right NAPI for rx is already implemented, so using GRO is a trivial patch.
