9000 is maximum size for large packets. 1500 is standard packet size. Plus if you network wraps original ip packets to some tunnel that size (1500) can be increased.
On Tue, 16 Oct 2018 at 23:45, gyanesh patra <pgyanesh.pa...@gmail.com> wrote: > Hi Maxim, > Increasing the POOL_SEG_LEN worked. But i am not sure how to calculate the > necessary value to use? > I was using the values from the odp_l2fwd example before. But now i > required to increase it upto 2200 for it to work. > Is there any guideline how to calculate this value? And also does it have > any impact on performance? > > Regarding the examples, i tried with odp_l2fwd_simple and odp_switch and > faced the same problem. But in my case "odp_l2fwd" example never recieves > any packets. Hence i have not been able to test that. If you can give any > input regarding this, it will be helpful too. > Thanks for your help. > > Regards, > P Gyanesh Kumar Patra > > > On Tue, Oct 16, 2018 at 3:36 PM Maxim Uvarov <maxim.uva...@linaro.org> > wrote: > >> DPDK as ODP can have packets which are not in physacally continius >> memory. I.e. packet can be split on several memory segments. That is not >> supported by current code and you have this warning. I think that we have >> dpdk pkio validation test and it works with large packets. But to do that >> you need to be sure that you created pool with right parameters. In your >> case POOL_SEG_LEN has to be increased. >> >> Also you can try more featured example: ./test/performance/odp_l2fwd >> >> Best Regards, >> Maxim. >> >> >> On Tue, 16 Oct 2018 at 20:49, gyanesh patra <pgyanesh.pa...@gmail.com> >> wrote: >> >>> Hi, >>> I am facing problem while using ODP master branch with DPDK pktio & >>> zero-pkt-copy as below: >>> >>> ODP/bin/# ./odp_l2fwd_simple ./odp_l2fwd_simple >>> >>> pktio/dpdk.c:851:mbuf_to_pkt_zero():Segmented buffers not supported >>> pktio/dpdk.c:851:mbuf_to_pkt_zero():Segmented buffers not supported >>> pktio/dpdk.c:851:mbuf_to_pkt_zero():Segmented buffers not supported >>> pktio/dpdk.c:851:mbuf_to_pkt_zero():Segmented buffers not supported >>> >>> This error is present for dpdk pktio only. It appears with larger packet >>> sizes like 1518bytes, 1280bytes. But everything works fine with 1024bytes >>> and smaller packets. >>> >>> I have verified that the packets have IP-don't fragment flag set. And >>> Wireshark doesn't show any abnormality with the pcap. >>> Is it broken or we need to specify some extra flags? >>> >>> I am on: >>> commit 570758a22fd0d6e2b2a73eb8ed0a8360a5b0ef32 >>> Author: Matias Elo <matias....@nokia.com> >>> Date: Tue Oct 2 14:13:35 2018 +0300 >>> linux-gen: ring: allocate global data from shm >>> >>> >>> Thanks, >>> P Gyanesh Kumar Patra >>> >>
