From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla@dpdk.org
Subject: [Bug 185] PVP zero-loss performance degradation without
--legacy-mem
Date: Thu, 10 Jan 2019 10:52:59 +0000
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https://bugs.dpdk.org/show_bug.cgi?id=3D185
Bug ID: 185
Summary: PVP zero-loss performance degradation without
--legacy-mem
Product: DPDK
Version: 18.05
Hardware: All
OS: All
Status: CONFIRMED
Severity: normal
Priority: Normal
Component: core
Assignee: dev@dpdk.org
Reporter: maxime.coquelin@redhat.com
Target Milestone: ---
When doing PVP (Physical to Virtual to Physical) testing,
we measure a performance degradation when testpmd in guest
is launched without the --legacy-mem parameter.
P to V and V to P forwarding is done using OVS-DPDK on host side.
Without the --legacy-mem option, we get ~23% of line rate at 10G.
With the --legacy-mem option, we get ~29% of line rate at 10G.
1G hugepages are used both in host and guest.
Testpmd command line used in guest:
testpmd -c 7 -n 4 --socket-mem 2048 0 -w 0000:00:02.0 --legacy-mem -- --bur=
st
64 -i --rxq=3D2 --txq=3D2 --rxd=3D4096 --txd=3D1024 --coremask=3D6 --auto-s=
tart
--port-topology=3Dchained --forward-mode=3Dmacswap
testpmd -c 7 -n 4 --socket-mem 2048 0 -w 0000:00:02.0 -- --burst 64 -i --rx=
q=3D2
--txq=3D2 --rxd=3D4096 --txd=3D1024 --coremask=3D6 --auto-start --port-topo=
logy=3Dchained
--forward-mode=3Dmacswap
--=20
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