Hi Vincenzo, Thank you for pointing me in right direction. Yes indeed, those were overflow buffers that did the trick. I did not point them back before closing. (I am using linux).
Martina On Dec 3, 2017 08:56, "Vincenzo Maffione" <v.maffi...@gmail.com> wrote: > Hi, > It may be related to the "extra buffers feature" of netmap, that lb uses. > When the netmap port is opened, some additional buffers (not bound to any > netmap ring) are allocated to be used by the application for slot swapping. > They are provided through the ni_bufs_head field as a linked list (see > updated netmap manual https://github.com/luigirizzo/ > netmap/blob/master/share/man/man4/netmap.4 ). > To free them, the free list must be returned when closing the netmap file > descriptor, using the same ni_bufs_head field. > > To check if this is true you could make sure that you are using "-B 0" > option, which means no extra buffers are used. > > Are you using the latest netmap code from github? Are you using FreeBSD or > Linux? > > Cheers, > Vincenzo > > 2017-12-01 15:21 GMT+01:00 Martina Balintova <balint.mart...@gmail.com>: > >> Hi, >> I am currently playing with lb app in netmap. Every time I kill/close it, >> the app hangs for some time and does not end immediately. In syslogs I am >> getting: >> ' >> Netmap_do_unregif deleting last instance for myapp{1 >> Netmap_do_deref active=5 >> Netnap_obj_free ouch, double free on buffer 27777 >> Netmap_extra_free freed 0 buffers >> ' >> >> This happens when I have some consumer on the pipe and at some point >> during >> whole lb lifetime, it did not consume all packets (resulting in oq being >> filled or packets being dropped). If the pipe did not ever have a >> consumer, >> then it will not end up in the double free. >> I am finding it quite hard to debug in gdb, as this is happening at the >> shutdown. >> Could someone pls point me to reason? >> >> I am running lb with one interface and 2 groups, different numb of pipes >> per group and this happens even with no extra buffers. >> >> Martina >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" >> > > > > -- > Vincenzo Maffione > _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
