Hi Gautam pf_ring leverages on the linux kernel defragmentation support, thus we cannot do much on our side for that, I see that your application is not exceeding 30% of cpu usage, are you sure you do not have spikes that are hard to detect and your application cannot keep up with processing? Please provide pf_ring statistics in order to figure out if packet loss is at kernel level or application level.
Alfredo > On 20 Mar 2018, at 05:19, Chandrika Gautam <[email protected]> > wrote: > > Hi Alfredo, > > Yes its a standard driver (Intel 82599 10 G) and server is hpdl380g9 > servers(cpu clock speed 2GHz ). > > We have another deployment in which fragmentation logic is enabled in > applications(g8 2.9 GHz) and we are not observing a drop in pf_ring stats. > > How can we prove this to customer that enabling fragmentation in pf_ring > kernel could be causing this? > Or can we tune ipfrag related parameters to support more number of fragmented > packets. > > > On Mon, Mar 19, 2018 at 1:51 PM, Alfredo Cardigliano <[email protected] > <mailto:[email protected]>> wrote: > Hi Gautam > I guess you are using standard drivers, with defragmentation enabled in the > pf_ring kernel module, > in that case if you have many fragments, at that rate, that could slow down > the processing. Did you > try disabling defragmentation to figure out if the bottleneck is there? > > Regards > Alfredo > > > On 19 Mar 2018, at 06:35, Chandrika Gautam <[email protected] > > <mailto:[email protected]>> wrote: > > > > Hi, > > > > We are observing some intermittent drops in pf_ring statistics in one of > > the production sites. I need your valuable inputs to debug this issue. > > > > Brief description of the setup is - > > > > Fragmentation is enabled at kernel level. Traffic at site is varying from > > 500Mbps to 1 Gbps. We have observed cpu usage per thread of our application > > and it is not exceeding ~20-30 percent and there are no alarms raised by > > applications. > > So I am suspecting whether kernel fragmentation logic could slow down the > > processing and causing pf_ring to drop these packets. Can you please > > confirm whether this can cause the drop ?If yes, How shall we debug this > > issue. > > Please let me know if you need any data from the sites. > > > > > > Regards, > > Gautam > > _______________________________________________ > > Ntop-misc mailing list > > [email protected] <mailto:[email protected]> > > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > <http://listgateway.unipi.it/mailman/listinfo/ntop-misc> > > > _______________________________________________ > Ntop-misc mailing list > [email protected] <mailto:[email protected]> > http://listgateway.unipi.it/mailman/listinfo/ntop-misc > <http://listgateway.unipi.it/mailman/listinfo/ntop-misc> > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc
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