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dpif-netdev: Skip EMC lookup when EMC is disabled.

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Conditional EMC insert patch gives the flexibility to configure the
probability of flow insertion in to EMC. This also allows an option to
entirely disable EMC by setting 'emc-insert-inv-prob=0' which can be
useful at large number of parallel flows.

This patch skips EMC lookup when EMC is disabled. This is useful to
avoid wasting CPU cycles and also improve performance considerably.

Signed-off-by: Bhanuprakash Bodireddy <bhanuprakash.bodireddy@intel.com>
CC: Ciara Loftus <ciara.loftus@intel.com>
CC: Georg Schmuecking <georg.schmuecking@ericsson.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Acked-by: Darrell Ball dlu998@gmail.com
This commit is contained in:
Bhanuprakash Bodireddy
2017-03-12 17:33:24 +00:00
committed by Ben Pfaff
parent 49f173446b
commit f79b1ddb84
1 changed files with 5 additions and 1 deletions
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6
lib/dpif-netdev.c
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@@ -4500,8 +4500,11 @@ emc_processing(struct dp_netdev_pmd_thread *pmd,
size_t n_missed = 0, n_dropped = 0;
struct dp_packet *packet;
const size_t size = dp_packet_batch_size(packets_);
uint32_t cur_min;
int i;
atomic_read_relaxed(&pmd->dp->emc_insert_min, &cur_min);
DP_PACKET_BATCH_REFILL_FOR_EACH (i, size, packet, packets_) {
struct dp_netdev_flow *flow;
@@ -4525,7 +4528,8 @@ emc_processing(struct dp_netdev_pmd_thread *pmd,
key->len = 0; /* Not computed yet. */
key->hash = dpif_netdev_packet_get_rss_hash(packet, &key->mf);
flow = emc_lookup(flow_cache, key);
/* If EMC is disabled skip emc_lookup */
flow = (cur_min == 0) ? NULL: emc_lookup(flow_cache, key);
if (OVS_LIKELY(flow)) {
dp_netdev_queue_batches(packet, flow, &key->mf, batches,
n_batches);