[PATCH 04/24] net, diet: Make FIB hash tables smaller with CONFIG_BASE_SMALL
From: Andi Kleen <hidden>
Date: 2014-05-05 22:26:23
Also in:
lkml
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
From: Andi Kleen <redacted> Just make the FIB hash tables much smaller for small kernel. Signed-off-by: Andi Kleen <redacted> --- include/net/ip_fib.h | 5 +++++ net/ipv4/fib_semantics.c | 4 ++++ 2 files changed, 9 insertions(+)
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 9922093..cbe60cd 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h@@ -65,7 +65,11 @@ struct fnhe_hash_bucket { struct fib_nh_exception __rcu *chain; }; +#ifdef CONFIG_BASE_SMALL +#define FNHE_HASH_SIZE 16 +#else #define FNHE_HASH_SIZE 2048 +#endif #define FNHE_RECLAIM_DEPTH 5 struct fib_nh {
@@ -162,6 +166,7 @@ struct fib_result_nl { #ifdef CONFIG_IP_MULTIPLE_TABLES #define FIB_TABLE_HASHSZ 256 #else +/* Can we use 1 for BASE_SMALL? */ #define FIB_TABLE_HASHSZ 2 #endif
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 8a043f0..c3d4e4d 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c@@ -51,7 +51,11 @@ static struct hlist_head *fib_info_laddrhash; static unsigned int fib_info_hash_size; static unsigned int fib_info_cnt; +#ifdef CONFIG_BASE_SMALL +#define DEVINDEX_HASHBITS 2 +#else #define DEVINDEX_HASHBITS 8 +#endif #define DEVINDEX_HASHSIZE (1U << DEVINDEX_HASHBITS) static struct hlist_head fib_info_devhash[DEVINDEX_HASHSIZE];
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1.9.0