On 11 February 2013 12:19, Dan Shechter <[email protected]> wrote: > Hi All, > > I have a very latency sensitive application. I need to move packets > from one interface to another > > I am using a quad 1000/pro Intel NIC. pcidump shows 82571EB > > My latency sensitive application reads packets from one em interface > using libpcap and sends packet to another em interface using udp > socket. > > Does em has interrupt mitigation enabled?
It does. > If interrupt mitigation is enabled would disabling it will reduce latency? It would. > How can I disable the interrupt mitigation for em NICs? I suggest you try increasing MAX_INTS_PER_SEC define by the factor or two in /sys/dev/pci/if_em.h. In case it doesn't suite your needs you can try commenting out this line: E1000_WRITE_REG(&sc->hw, ITR, DEFAULT_ITR); > What would change in 5.3? > Nothing regarding interrupt moderation. > Best regards, > Dan > Cheers, Mike
