Hi all,
I'm looking at the performance of OVS-DPDK when offloading up to 1M flows
to hardware and I'm seeing an excessive amount of time being spent in the
clock_gettime() call. For the samples I have taken using Intel's VTune
profiler I'm seeing just under a quarter of the entire time in
clock_gettime().
Is this expected and/or are there any build or runtime options to alleviate
this?
I'm testing on a Dell R760 server running Redhat Linux 9.1
(5.14.0-162.6.1.el9_1.x86_64)
Top Hotspots
Function Module CPU Time % of CPU Time
clock_gettime libc.so.6 97.908s 22.2%
dp_netdev_process_rxq_port ovs-vswitchd 78.844s 17.9%
pmd_perf_end_iteration ovs-vswitchd 35.506s 8.0%
bnxt_rep_rx_burst ovs-vswitchd 35.330s 8.0%
bnxt_recv_pkts ovs-vswitchd 33.970s 7.7%
[Others] N/A* 159.643s 36.2%
The call stack of the clock_gettime() calls:
libc.so.6 ! clock_gettime
ovs-vswitchd ! time_usec + 0x2f
ovs-vswitchd ! pmd_thread_main + 0x57c
ovs-vswitchd ! ovsthread_wrapper + 0x74
libc.so.6 ! start_thread + 0x2d1
libc.so.6 ! __clone3 + 0x2f
Thanks,
Pete
--
Peter Spreadborough | Master Engineer, CCX
Broadcom Corporation | (O) 978-689-1685 | (M) 508-633-2259
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