OVS userspace datapath is a program with heavy memory access. It needs to
load/store a large number of memory, including packet header, metadata,
EMC/SMC/DPCLS tables and so on. It causes a lot of cache line missing and
refilling, which has a great impact on flow scalability. And in some cases,
EMC has a negative impact on the overall performance. It is difficult for
user to dynamically manage the enabling of EMC.
This series of patches improve memory access of userspace datapath as
follows:
1. Reduce the number of metadata cache line accessed by non-tunnel traffic.
2. Decrease unnecessary memory load/store for batch/flow.
3. Modify the layout of EMC data struct. Centralize the storage of hash
value.
In the NIC2NIC traffic tests, the overall performance improvement is
observed, especially in multi-flow cases.
Flows delta
1-1K flows 5-10%
10K flows 20%
100K flows 40%
EMC disable 10%
Malvika Gupta (1):
[ovs-dev] dpif-netdev: Modify dfc_processing function to void function
Yanqin Wei (5):
netdev: avoid unnecessary packet batch refilling in netdev feature
check
dpif-netdev: add tunnel_valid flag to skip ip/ipv6 address comparison
dpif-netdev: improve emc lookup performance by contiguous storage of
hash value.
dpif-netdev: skip flow hash calculation in case of smc disabled
dpif-netdev: remove unnecessary key length calculation in fast path
lib/dp-packet.h | 12 +++--
lib/dpif-netdev.c | 115 ++++++++++++++++++++++++----------------------
lib/flow.c | 2 +-
lib/netdev.c | 13 ++++--
lib/packets.h | 46 ++++++++++++++++---
5 files changed, 120 insertions(+), 68 deletions(-)
--
2.17.1
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