diff options
author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-29 11:53:50 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2010-09-30 17:59:30 -0700 |
commit | dd28d1a0b5ecc0f5512f658b1a8fd38bc4f4c98c (patch) | |
tree | 5cee646dfe354803f0b6f7b9ddd11c189c4ee8e3 /drivers/net/phy/Makefile | |
parent | e1a5964f0c32a75b17360cfc565d25aaedbff747 (diff) | |
download | op-kernel-dev-dd28d1a0b5ecc0f5512f658b1a8fd38bc4f4c98c.zip op-kernel-dev-dd28d1a0b5ecc0f5512f658b1a8fd38bc4f4c98c.tar.gz |
ipv4: __mkroute_output() speedup
While doing stress tests with a disabled IP route cache, I found
__mkroute_output() was touching three times in_device atomic refcount.
Use RCU to touch it once to reduce cache line ping pongs.
Before patch
time to perform the test
real 1m42.009s
user 0m12.545s
sys 25m0.726s
Profile :
16109.00 26.4% ip_route_output_slow vmlinux
7434.00 12.2% dst_destroy vmlinux
3280.00 5.4% fib_rules_lookup vmlinux
3252.00 5.3% fib_semantic_match vmlinux
2622.00 4.3% fib_table_lookup vmlinux
2535.00 4.1% dst_alloc vmlinux
1750.00 2.9% _raw_read_lock vmlinux
1532.00 2.5% rt_set_nexthop vmlinux
After patch
real 1m36.503s
user 0m12.977s
sys 23m25.608s
14234.00 22.4% ip_route_output_slow vmlinux
8717.00 13.7% dst_destroy vmlinux
4052.00 6.4% fib_rules_lookup vmlinux
3951.00 6.2% fib_semantic_match vmlinux
3191.00 5.0% dst_alloc vmlinux
1764.00 2.8% fib_table_lookup vmlinux
1692.00 2.7% _raw_read_lock vmlinux
1605.00 2.5% rt_set_nexthop vmlinux
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/Makefile')
0 files changed, 0 insertions, 0 deletions