diff options
| author | Miquel van Smoorenburg <miquels@cistron.nl> | 2008-06-27 17:23:57 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-27 17:23:57 -0700 |
| commit | 57413ebc4e0f1e471a3b4db4aff9a85c083d090e (patch) | |
| tree | 325ee5d251700d991cea87d2c4d643b374959095 /net | |
| parent | 479798211967cd828e09ce27775b8cbfe99462ab (diff) | |
| download | lwn-57413ebc4e0f1e471a3b4db4aff9a85c083d090e.tar.gz lwn-57413ebc4e0f1e471a3b4db4aff9a85c083d090e.zip | |
tcp: calculate tcp_mem based on low memory instead of all memory
The tcp_mem array which contains limits on the total amount of memory
used by TCP sockets is calculated based on nr_all_pages. On a 32 bits
x86 system, we should base this on the number of lowmem pages.
Signed-off-by: Miquel van Smoorenburg <miquels@cistron.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index fc54a48fde1e..850825dc86e6 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -260,6 +260,8 @@ #include <linux/socket.h> #include <linux/random.h> #include <linux/bootmem.h> +#include <linux/highmem.h> +#include <linux/swap.h> #include <linux/cache.h> #include <linux/err.h> #include <linux/crypto.h> @@ -2620,7 +2622,7 @@ __setup("thash_entries=", set_thash_entries); void __init tcp_init(void) { struct sk_buff *skb = NULL; - unsigned long limit; + unsigned long nr_pages, limit; int order, i, max_share; BUILD_BUG_ON(sizeof(struct tcp_skb_cb) > sizeof(skb->cb)); @@ -2689,8 +2691,9 @@ void __init tcp_init(void) * is up to 1/2 at 256 MB, decreasing toward zero with the amount of * memory, with a floor of 128 pages. */ - limit = min(nr_all_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); - limit = (limit * (nr_all_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); + nr_pages = totalram_pages - totalhigh_pages; + limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); + limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); limit = max(limit, 128UL); sysctl_tcp_mem[0] = limit / 4 * 3; sysctl_tcp_mem[1] = limit; |