> On Sep 16, 2019, at 7:22 AM, Benoit Ganne (bganne) <[email protected]> wrote: > >> I tried "perf record --call-graph fp" but the results seemed odd (e.g., I >> see a tcp function symbol deep within a call-branch rooted in the dpdk >> crypto device enqueue routine for the marvell mvsam cryptodev). > > Just in case, did you try "--call-graph lbr" (on Intel CPU older than Haswell > I think) or "--call-graph dwarf"? The frame pointer is usually unreliable > with optimized code unfortunately.
Could these odd symbols I'm seeing be the result of link-time optimization?
Here's an example:
| --0.00%-- dpdk_update_link_state
| rte_eth_link_get_nowait
| |
| |--0.00%-- mrvl_link_update
| | pp2_port_get_link_state
| | __socket
| | el0_svc_naked
| | sys_socket
| | __sock_create
| | inet_create
| | tcp_v4_init_sock
| | tcp_init_sock
| | tcp_assign_congestion_control
Thanks,
Chris.
>
> Best
> ben
>
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