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authorJesper Dangaard Brouer <brouer@redhat.com>2013-01-29 00:44:14 +0100
committerDavid S. Miller <davem@davemloft.net>2013-01-29 19:36:23 +0100
commitcd39a7890aed7433beb3188c7ad8591e260ebf10 (patch)
tree1a5de7566bbc4e1cb5f00495c664c27abc1085d4 /include/net/inet_frag.h
parentnet: ks8851: convert to threaded IRQ (diff)
downloadlinux-cd39a7890aed7433beb3188c7ad8591e260ebf10.tar.xz
linux-cd39a7890aed7433beb3188c7ad8591e260ebf10.zip
net: cacheline adjust struct netns_frags for better frag performance
This small cacheline adjustment of struct netns_frags improves performance significantly for the fragmentation code. Struct members 'lru_list' and 'mem' are both hot elements, and it hurts performance, due to cacheline bouncing at every call point, when they share a cacheline. Also notice, how mem is placed together with 'high_thresh' and 'low_thresh', as they are used in the compare operations together. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_frag.h')
-rw-r--r--include/net/inet_frag.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 32786a044718..91e77975eaa6 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -3,9 +3,12 @@
struct netns_frags {
int nqueues;
- atomic_t mem;
struct list_head lru_list;
+ /* Its important for performance to keep lru_list and mem on
+ * separate cachelines
+ */
+ atomic_t mem ____cacheline_aligned_in_smp;
/* sysctls */
int timeout;
int high_thresh;