This series introduces in dpif-netdev an exact match cache for frequently
used flows. It uses the RSS hash (currently implemented only for netdev-dpdk)
to search the miniflow in an hash table.
While there might be still some tuning left to do, these patch provides
significant performance improvements for the following simple testcase:
CPU: Intel(R) Xeon(R) CPU E5-2650 0 @ 2.00GHz
NIC: Intel Corporation Ethernet Controller 10-Gigabit X540-AT2 (rev 01)
dual port (dpdk0, dpdk1)
Bridge "br0"
Port "dpdk1"
Interface "dpdk1"
type: dpdk
Port "br0"
Interface "br0"
type: internal
Port "dpdk0"
Interface "dpdk0"
type: dpdk
Source connected to dpdk0, sink to dpdk1
1 flow 64 bytes UDP packets going from source to sink
zero drop throughput:
master: ~ 5.6 Mpps
new patch: ~13.0 Mpps
v5:
- Pravin suggestions:
+ cosmetic changes
+ reorder struct emc_entry for performance
+ correct order of mutex in comment
+ introduced dpif_netdev_packet_get_dp_hash()
+ emc replacement policy based on the hash value
+ define EM_BATCH_SIZE
+ added OVS_UNLIKELY annotation
- Jarno suggestions:
+ improved comment on exact match cache hash table
+ added missing braces
v4:
- Pravin suggestions:
+ merged dpif_packet->dp_hash with dpdk rss (removed dp_netdev_rss and
moved ofpbuf_rss() to dpif_packet_rss())
+ initialize and free exact match cache out of the mutex
+ Added EMC_FOR_EACH_POS_WITH_HASH() and better conditions in iteration
+ Freeing exact match cache on pmd_thread reload to delete old flows
+ Small changes to batching and swapping code
- Suppressed sparse warnings about variable length array
v3:
- Ben suggestions:
+ fixed several coding style issues
v2:
- Implemented Pravin suggestions:
+ dp_netdev_rss()
+ reverse order of batch lookup in dp_netdev_queue_batches()
- Split dp_netdev_input() in two functions to save memory in exact match
cache processing
- Use variable length arrays to reduce cache footprint
- Rebased
Daniele Di Proietto (2):
packet-dpif: Add dpif_packet_{get,set}_hash()
dpif-netdev: Exact match cache
lib/dpif-netdev.c | 449 ++++++++++++++++++++++++++++++++++++++++++++---------
lib/netdev-bsd.c | 1 +
lib/netdev-dpdk.c | 3 +-
lib/netdev-dummy.c | 1 +
lib/netdev-linux.c | 1 +
lib/odp-execute.c | 5 +-
lib/packet-dpif.c | 2 +-
lib/packet-dpif.h | 21 +++
8 files changed, 405 insertions(+), 78 deletions(-)
--
2.1.0.rc1
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