Thanks Brian/Dave. This really helped in resolving the mystery.
I was surprised because in this vlib_main() latency pops up on v1804
release and not v1801 (using -p option). Anyways thanks.
-Nitin
On Wednesday 09 May 2018 08:49 PM, Dave Barach wrote:
+1, that’s exactly what you’re seeing… D.
*From:* vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> *On Behalf Of *Brian
Brooks
*Sent:* Wednesday, May 9, 2018 11:00 AM
*To:* Saxena, Nitin <nitin.sax...@cavium.com>; vpp-dev <vpp-dev@lists.fd.io>
*Subject:* Re: [vpp-dev] vlib_main() taking maximum cycle in v1804 release
I think this is due to perf aggregating results from all CPUs, and that
vlib_main hotspot is from the main (non-worker) thread.
*From:* vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>
<vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>> *On Behalf Of
*Saxena, Nitin
*Sent:* Thursday, April 26, 2018 1:46 PM
*To:* vpp-dev <vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io>>
*Subject:* [vpp-dev] vlib_main() taking maximum cycle in v1804 release
Hi,
While running L3 Fwd test case with VPP v1804 release (released
yesterday), perf tool shows vlib_main() taking maximum cycles.
This has been observed on Aarch64 (Both on Marvell’s Macchiatobin and
Cavium’s ThunderX products) and Broadwell machine as well.
Perf top from Broadwell machine
=========================
29.72% libvlib.so.0.0.0 [.] vlib_main
17.33% dpdk_plugin.so [.] i40e_xmit_pkts
7.35% dpdk_plugin.so [.] i40e_recv_scattered_pkts_vec
7.21% libvlibmemory.so.0.0.0 [.] memclnt_queue_callback
6.02% libvnet.so.0.0.0 [.] ip4_rewrite_avx2
5.96% libvnet.so.0.0.0 [.] ip4_lookup_avx2
5.69% libvnet.so.0.0.0 [.] ip4_input_no_checksum_avx2
5.49% dpdk_plugin.so [.] dpdk_input_avx2
3.40% dpdk_plugin.so [.] dpdk_interface_tx_avx2
1.63% libvnet.so.0.0.0 [.] vnet_interface_output_node_avx2
Is this the expected behaviour? I haven’t observed vlib_main() taking
max perf cycles in VPP v1801.
Thanks,
Nitin
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