Hi Alfredo, Yes I am quite sure that this is due to fragmentation logic in kernel not in application. We have one deployment where fragmentation logic is enabled in application but we do not see any drops in pf_ring statistics also.
Will output of /proc/net/pf_ring/<pid> be enough ? Are you looking for some other statistics? Regards, Chandrika On Tue, Mar 20, 2018 at 2:23 PM, Alfredo Cardigliano <[email protected]> wrote: > 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] > > 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]> 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] >> > http://listgateway.unipi.it/mailman/listinfo/ntop-misc >> >> >> _______________________________________________ >> 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 > > > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc >
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