On Fri, 2017-08-25 at 18:17 -0700, Florian Fainelli wrote: > On 08/25/2017 04:57 PM, Eric Dumazet wrote: > > On Fri, 2017-08-25 at 16:18 -0700, Florian Fainelli wrote: > > > >> Eric, are there areas of the stack where we are allowed to drop packets, > >> not propagate that back to write(2) and also not increment any counter > >> either, or maybe I am not looking where I should... > > > > What happens if you increase these sysctls ? > > I don't see packet loss after I tweak these two sysctls according to > your suggestions. > > Tweaking eth0's sysctls did not change anything, but tweaking gphy's > sysctl resolved the loss. This was a little surprising considering that > gphy is an IFF_NO_QUEUE interface and eth0 is the conduit interface that > does the real transmission. > > Does that make sense with respect to what I reported earlier? Should I > try to dump the neigh stats?
Note that if you had TCP traffic, the neighbour would be constantly confirmed and no losses would happen. I guess we should an SNMP counter for packets dropped in neigh queues.
