Commit 7b4f4b5e authored by John Heffner's avatar John Heffner Committed by David S. Miller
Browse files

[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: default avatarJohn Heffner <jheffner@psc.edu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2babf9da

net/ipv4/tcp.c

+14 −9
Original line number Diff line number Diff line
@@ -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",

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