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authorNeil Horman <nhorman@tuxdriver.com>2009-07-30 18:52:15 -0700
committerDavid S. Miller <davem@davemloft.net>2009-07-30 18:52:15 -0700
commita33bc5c15154c835aae26f16e6a3a7d9ad4acb45 (patch)
treecf7683b1b2d2fd170bfc6650ea84a4b9a81eebbf /include/net/xfrm.h
parent9aada7ac047f789ffb27540cc1695989897b2dfe (diff)
downloadlinux-a33bc5c15154c835aae26f16e6a3a7d9ad4acb45.tar.bz2
xfrm: select sane defaults for xfrm[4|6] gc_thresh
Choose saner defaults for xfrm[4|6] gc_thresh values on init Currently, the xfrm[4|6] code has hard-coded initial gc_thresh values (set to 1024). Given that the ipv4 and ipv6 routing caches are sized dynamically at boot time, the static selections can be non-sensical. This patch dynamically selects an appropriate gc threshold based on the corresponding main routing table size, using the assumption that we should in the worst case be able to handle as many connections as the routing table can. For ipv4, the maximum route cache size is 16 * the number of hash buckets in the route cache. Given that xfrm4 starts garbage collection at the gc_thresh and prevents new allocations at 2 * gc_thresh, we set gc_thresh to half the maximum route cache size. For ipv6, its a bit trickier. there is no maximum route cache size, but the ipv6 dst_ops gc_thresh is statically set to 1024. It seems sane to select a simmilar gc_thresh for the xfrm6 code that is half the number of hash buckets in the v6 route cache times 16 (like the v4 code does). Signed-off-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/xfrm.h')
-rw-r--r--include/net/xfrm.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 9e3a3f4c1f60..223e90a44824 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1280,7 +1280,7 @@ struct xfrm6_tunnel {
};
extern void xfrm_init(void);
-extern void xfrm4_init(void);
+extern void xfrm4_init(int rt_hash_size);
extern int xfrm_state_init(struct net *net);
extern void xfrm_state_fini(struct net *net);
extern void xfrm4_state_init(void);