Re: [dpdk-users] Problem profiling DPDK

[이지수 <skan1543@gmail.com>]

Ok,

I compiled DPDK properly but didn't install it with 'make install
T=$RTE_TARGET' command and I think that was the problem.
Now I can see all symbols in the perf report.

Thanks.

Regards,

Jeesoo Lee


2018-07-17 0:47 GMT+09:00 Wiles, Keith <keith.wiles@intel.com>:

>
>
> Sent from my iPhone
>
> > On Jul 16, 2018, at 1:11 AM, 이지수 <skan1543@gmail.com> wrote:
> >
> > Hi,
> >
> > I have some issues with receiving 60bytes size packets without loss, so
> > used perf tools to see what's happening.
> >
> > I built DPDK and application which I'm using (DPDK-pktgen) with proper
> > options for debugging (-g, O0) and here is my perf report's result.
> >
> >
> > # Children      Self  Command        Shared Object      Symbol
> >    89.16%     0.00%  lcore-slave-8  pktgen             [.]
> eal_thread_loop
> >    89.16%     0.00%  lcore-slave-8  pktgen             [.]
> > pktgen_launch_one_lcore
> >    89.09%     0.66%  lcore-slave-8  pktgen             [.]
> > pktgen_main_rxtx_loop
> >    86.86%     2.43%  lcore-slave-8  pktgen             [.]
> > pktgen_main_receive
> >    47.08%    34.92%  lcore-slave-8  pktgen             [.]
> rte_pktmbuf_free
> >    33.78%     5.77%  lcore-slave-8  pktgen             [.]
> > pktgen_packet_classify_bulk
> >    23.29%    11.15%  lcore-slave-8  pktgen             [.]
> > pktgen_packet_classify
> >    10.93%    10.89%  lcore-slave-8  pktgen             [.]
> > i40e_recv_pkts_vec
> >    10.84%     0.00%  lcore-slave-8  [unknown]          [.]
> > 0x00303a3420205852
> >    10.83%     0.00%  lcore-slave-8  [unknown]          [.]
> > 0x00007f877d914680
> >    10.52%    10.49%  lcore-slave-8  pktgen             [.]
> > pktgen_packet_type
> >     7.35%     3.05%  lcore-slave-8  pktgen             [.]
> > rte_mbuf_refcnt_read
> >     4.36%     4.35%  lcore-slave-8  pktgen             [.]
> > rte_atomic16_read
> >     4.35%     4.34%  lcore-slave-8  pktgen             [.] rte_prefetch0
> >     3.32%     3.31%  lcore-slave-8  pktgen             [.]
> > rte_memcpy_generic
> >
> > I could see many readable symbols but there are two unknown symbols
> taking
> > 10% at Children column.
>
>
> These could be the calls to rte_manage_timer() as not much else is going
> on here for the code point of view.
>
> Notice the application is unknown and not pktgen so could be something in
> Linux. You can try vtune.
> >
> > Does anyone have ideas what these symbols are?
> >
> > Thanks in advance.
> >
> > Regards,
> >
> > Jeesoo Lee
>