> On 14 Oct 2015, at 07:56, 王勇 <[email protected]> wrote: > > Hi, all > > I have a box equipped with 32 cores (2 cpus and hyperthread is enabled) and a > 4-port intel 82576 card. There are 2 nprobe running on this machine listening > 2 ports which having about 200Mbps(less then 100kpps) on each of them. The > pf-ring version is 5.6 in mode 2. > > what I observed about the packet dropping is: > 1. the tot pkt lost in /proc/net/pfring/info is 0
/proc/net/pf_ring/info does not contain drop stats.. > 2. the tot packet drop in ifconfig for the port is not zero and keep > increasing on the rate of several thousands packet a second. This means kernel is not able to move packets off the card fast enough. > 3. the num free slot remains above 0. so that means the nprobe is fast enough. Correct. > > so, in this situation, what is the root cause of the packet drop, thank you > for any comment! The NAPI mechanism seems to be the bottleneck, please try playing with RSS, otherwise you should try with ZC drivers. Alfredo > > Alan > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc _______________________________________________ Ntop-misc mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop-misc
