Thanks, Are there any other tips to reduce latency?
Best regards, Dan On Mon, Feb 11, 2013 at 1:43 PM, Mike Belopuhov <[email protected]> wrote: > 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
