diff options
| -rw-r--r-- | Documentation/networking/ip-sysctl.txt | 5 | ||||
| -rw-r--r-- | include/net/ip.h | 4 | ||||
| -rw-r--r-- | net/ipv4/fib_trie.c | 14 | ||||
| -rw-r--r-- | net/ipv4/sysctl_net_ipv4.c | 9 |
4 files changed, 26 insertions, 6 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt index bd029fc55ccb..5eedc6941ce5 100644 --- a/Documentation/networking/ip-sysctl.txt +++ b/Documentation/networking/ip-sysctl.txt @@ -81,6 +81,11 @@ fib_multipath_hash_policy - INTEGER 0 - Layer 3 1 - Layer 4 +fib_sync_mem - UNSIGNED INTEGER + Amount of dirty memory from fib entries that can be backlogged before + synchronize_rcu is forced. + Default: 512kB Minimum: 64kB Maximum: 64MB + ip_forward_update_priority - INTEGER Whether to update SKB priority from "TOS" field in IPv4 header after it is forwarded. The new SKB priority is mapped from TOS field value diff --git a/include/net/ip.h b/include/net/ip.h index be3cad9c2e4c..aa09ae5f01a5 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -38,6 +38,10 @@ #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ #define IPV4_MIN_MTU 68 /* RFC 791 */ +extern unsigned int sysctl_fib_sync_mem; +extern unsigned int sysctl_fib_sync_mem_min; +extern unsigned int sysctl_fib_sync_mem_max; + struct sock; struct inet_skb_parm { diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index a573e37e0615..1704f432de1f 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -183,14 +183,16 @@ struct trie { }; static struct key_vector *resize(struct trie *t, struct key_vector *tn); -static size_t tnode_free_size; +static unsigned int tnode_free_size; /* - * synchronize_rcu after call_rcu for that many pages; it should be especially - * useful before resizing the root node with PREEMPT_NONE configs; the value was - * obtained experimentally, aiming to avoid visible slowdown. + * synchronize_rcu after call_rcu for outstanding dirty memory; it should be + * especially useful before resizing the root node with PREEMPT_NONE configs; + * the value was obtained experimentally, aiming to avoid visible slowdown. */ -static const int sync_pages = 128; +unsigned int sysctl_fib_sync_mem = 512 * 1024; +unsigned int sysctl_fib_sync_mem_min = 64 * 1024; +unsigned int sysctl_fib_sync_mem_max = 64 * 1024 * 1024; static struct kmem_cache *fn_alias_kmem __ro_after_init; static struct kmem_cache *trie_leaf_kmem __ro_after_init; @@ -504,7 +506,7 @@ static void tnode_free(struct key_vector *tn) tn = container_of(head, struct tnode, rcu)->kv; } - if (tnode_free_size >= PAGE_SIZE * sync_pages) { + if (tnode_free_size >= sysctl_fib_sync_mem) { tnode_free_size = 0; synchronize_rcu(); } diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index ba0fc4b18465..2316c08e9591 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -549,6 +549,15 @@ static struct ctl_table ipv4_table[] = { .mode = 0644, .proc_handler = proc_doulongvec_minmax, }, + { + .procname = "fib_sync_mem", + .data = &sysctl_fib_sync_mem, + .maxlen = sizeof(sysctl_fib_sync_mem), + .mode = 0644, + .proc_handler = proc_douintvec_minmax, + .extra1 = &sysctl_fib_sync_mem_min, + .extra2 = &sysctl_fib_sync_mem_max, + }, { } }; |