From 7b4f4b5ebceab67ce440a61081a69f0265e17c2a Mon Sep 17 00:00:00 2001 From: John Heffner Date: Sat, 25 Mar 2006 01:34:07 -0800 Subject: [PATCH] [TCP]: Set default max buffers from memory pool size This patch sets the maximum TCP buffer sizes (available to automatic buffer tuning, not to setsockopt) based on the TCP memory pool size. The maximum sndbuf and rcvbuf each will be up to 4 MB, but no more than 1/128 of the memory pressure threshold. Signed-off-by: John Heffner Signed-off-by: David S. Miller --- net/ipv4/tcp.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 4b0272c92d66..591e96dffc28 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -276,8 +276,8 @@ atomic_t tcp_orphan_count = ATOMIC_INIT(0); EXPORT_SYMBOL_GPL(tcp_orphan_count); int sysctl_tcp_mem[3]; -int sysctl_tcp_wmem[3] = { 4 * 1024, 16 * 1024, 128 * 1024 }; -int sysctl_tcp_rmem[3] = { 4 * 1024, 87380, 87380 * 2 }; +int sysctl_tcp_wmem[3]; +int sysctl_tcp_rmem[3]; EXPORT_SYMBOL(sysctl_tcp_mem); EXPORT_SYMBOL(sysctl_tcp_rmem); @@ -2081,7 +2081,8 @@ __setup("thash_entries=", set_thash_entries); void __init tcp_init(void) { struct sk_buff *skb = NULL; - int order, i; + unsigned long limit; + int order, i, max_share; if (sizeof(struct tcp_skb_cb) > sizeof(skb->cb)) __skb_cb_too_small_for_tcp(sizeof(struct tcp_skb_cb), @@ -2155,12 +2156,16 @@ void __init tcp_init(void) sysctl_tcp_mem[1] = 1024 << order; sysctl_tcp_mem[2] = 1536 << order; - if (order < 3) { - sysctl_tcp_wmem[2] = 64 * 1024; - sysctl_tcp_rmem[0] = PAGE_SIZE; - sysctl_tcp_rmem[1] = 43689; - sysctl_tcp_rmem[2] = 2 * 43689; - } + limit = ((unsigned long)sysctl_tcp_mem[1]) << (PAGE_SHIFT - 7); + max_share = min(4UL*1024*1024, limit); + + sysctl_tcp_wmem[0] = SK_STREAM_MEM_QUANTUM; + sysctl_tcp_wmem[1] = 16*1024; + sysctl_tcp_wmem[2] = max(64*1024, max_share); + + sysctl_tcp_rmem[0] = SK_STREAM_MEM_QUANTUM; + sysctl_tcp_rmem[1] = 87380; + sysctl_tcp_rmem[2] = max(87380, max_share); printk(KERN_INFO "TCP: Hash tables configured " "(established %d bind %d)\n",