Ok. I have 4.18.11 ubuntu. I will try out the latest kernel and will let you know. Thank you for your opinion and help.
Thanks, Anand On Wed, Nov 14, 2018 at 10:11 AM Willem de Bruijn <willemdebruijn.ker...@gmail.com> wrote: > > On Tue, Nov 13, 2018 at 8:29 PM Anand H. Krishnan > <anandhkrish...@gmail.com> wrote: > > > > skb_scrub_packet calls skb_orphan and from there the destructor is called. > > Not since > > commit 9c4c325252c54b34d53b3d0ffd535182b744e03d > skbuff: preserve sock reference when scrubbing the skb. > v4.19-rc1~140^2~523^2 > > But the general issue is valid that the tx_ring slot should not be > released until all users of the pages are freed, not just when the > skb is orphaned (e.g., on skb_set_owner_r). > > I think that this can happen even on a transmit to a physical > nic, if a clone is queued for reception on a packet socket. That > clone does not clone the destructor, so if the reader is slow, > the slot may be released from consume_skb on the original > path. > > I have not verified this yet. But if correct, then the long term > solution is to use refcounted uarg, similar to msg_zerocopy.
