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net: openvswitch: reorder masks array based on usage

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This patch reorders the masks array every 4 seconds based on their
usage count. This greatly reduces the masks per packet hit, and
hence the overall performance. Especially in the OVS/OVN case for
OpenShift.

Here are some results from the OVS/OVN OpenShift test, which use
8 pods, each pod having 512 uperf connections, each connection
sends a 64-byte request and gets a 1024-byte response (TCP).
All uperf clients are on 1 worker node while all uperf servers are
on the other worker node.

Kernel without this patch     :  7.71 Gbps
Kernel with this patch applied: 14.52 Gbps

We also run some tests to verify the rebalance activity does not
lower the flow insertion rate, which does not.

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Tested-by: Andrew Theurer <atheurer@redhat.com>
Reviewed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eelco Chaudron
2020-07-15 14:09:28 +02:00
committed by David S. Miller
parent b18432c5a4
commit eac87c413b
4 changed files with 207 additions and 7 deletions
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net/openvswitch/flow_table.h
+11
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@@ -27,9 +27,17 @@ struct mask_cache_entry {
u32 mask_index;
};
struct mask_count {
int index;
u64 counter;
};
struct mask_array {
struct rcu_head rcu;
int count, max;
u64 __percpu *masks_usage_cntr;
u64 *masks_usage_zero_cntr;
struct u64_stats_sync syncp;
struct sw_flow_mask __rcu *masks[];
};
@@ -86,4 +94,7 @@ bool ovs_flow_cmp(const struct sw_flow *, const struct sw_flow_match *);
void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
bool full, const struct sw_flow_mask *mask);
void ovs_flow_masks_rebalance(struct flow_table *table);
#endif /* flow_table.h */