[dts] DTS with pktgen crashes

[Dan Shimshoni <danshimsh@gmail.com>]

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Hello,
I am trying to run L2FW DTS with pktgen on
DELL R720 server, and I get "Illegal instruction".
I tried to find the root cause of the problem, and it seems related to
the pktgen binary, to something related to a CPU flag (RTE_CPUFLAG_RTM flag
(Transactional memory).

I cloned the latest DTS repo, and extracted pktgen
from it (it is in the dep/tgen.tgz tar file).
My first question is: is this binary created from the
official pktgen tree ? (in case it is, which version of pktgen is it?) or
is it after applying some patches? (the
reason for this question will be clear soon).

Second: when I try to run it as stand alone and look at the core dump, I
see the
following:

./pktgen

Illegal instruction (core dumped)

gdb ./pktgen core
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.3) 7.7.1
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Reading symbols from ./pktgen...done.
[New LWP 6639]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
---Type <return> to continue, or q <return> to quit---
Core was generated by `./pktgen'.
Program terminated with signal SIGILL, Illegal instruction.
#0  0x000000000043417d in rte_cpu_get_flag_enabled (feature=6217008,
    feature@entry=RTE_CPUFLAG_RTM)
    at /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_cpuflags.h:303
303     /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_cpuflags.h: No
such file or directory.
(gdb) bt
#0  0x000000000043417d in rte_cpu_get_flag_enabled (feature=6217008,
    feature@entry=RTE_CPUFLAG_RTM)
    at /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_cpuflags.h:303
#1  0x00000000004341ae in rte_rtm_init ()
    at /root/dpdk/x86_64-native-linuxapp-gcc/include/rte_spinlock.h:103
#2  0x00000000005d451d in __libc_csu_init ()
#3  0x00007fe2fda1aed5 in __libc_start_main (main=0x433400 <main>,
    argc=1, argv=0x7ffd0c6a5868, init=0x5d44d0 <__libc_csu_init>,
    fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7ffd0c6a5858) at libc-start.c:246
#4  0x0000000000435385 in _start ()
(gdb)


- and I get the same issue of "illegal instruction" and the same results
also with older
official DTS releases, like
https://dpdk.org/browse/tools/dts/snapshot/dts-17.11.tar.xz
and https://dpdk.org/browse/tools/dts/snapshot/dts-17.05.tar.xz

Regards,
Dan

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