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| author | Jason Wang <jasowang@redhat.com> | 2016-04-25 23:13:42 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-28 16:38:54 -0400 |
| commit | 3df97ba83019d524c012fd43d3216d4cc3005955 (patch) | |
| tree | d913793fb00287a9e120f36d9a6d274a0257c2f4 /net/core/dev.c | |
| parent | f345c9a5726d10cc3613d17ae75dcb1ab0986ba1 (diff) | |
| download | op-kernel-dev-3df97ba83019d524c012fd43d3216d4cc3005955.zip op-kernel-dev-3df97ba83019d524c012fd43d3216d4cc3005955.tar.gz | |
tuntap: calculate rps hash only when needed
There's no need to calculate rps hash if it was not enabled. So this
patch export rps_needed and check it before trying to get rps
hash. Tests (using pktgen to inject packets to guest) shows this can
improve pps about 13% (when rps is disabled).
Before:
~1150000 pps
After:
~1300000 pps
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
----
Changes from V1:
- Fix build when CONFIG_RPS is not set
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index e96a3bc..c2f3d5d 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -3469,6 +3469,7 @@ u32 rps_cpu_mask __read_mostly; EXPORT_SYMBOL(rps_cpu_mask); struct static_key rps_needed __read_mostly; +EXPORT_SYMBOL(rps_needed); static struct rps_dev_flow * set_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
