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tcp: halves tcp_mem[] limits

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Allowing tcp to use ~19% of physical memory is way too much,
and allowed bugs to be hidden. Add to this that some drivers use a full
page per incoming frame, so real cost can be twice the advertized one.

Reduce tcp_mem by 50 % as a first step to sanity.

tcp_mem[0,1,2] defaults are now 4.68%, 6.25%, 9.37% of physical memory.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-05-15 12:39:30 -07:00 committed by David S. Miller
parent 76dfa60820
commit b66e91ccbc
1 changed files with 5 additions and 4 deletions
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9
net/ipv4/tcp.c
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@ -3068,11 +3068,12 @@ __setup("thash_entries=", set_thash_entries);
static void __init tcp_init_mem(void) static void __init tcp_init_mem(void)
{ {
unsigned long limit = nr_free_buffer_pages() / 8; unsigned long limit = nr_free_buffer_pages() / 16;
limit = max(limit, 128UL); limit = max(limit, 128UL);
sysctl_tcp_mem[0] = limit / 4 * 3; sysctl_tcp_mem[0] = limit / 4 * 3; /* 4.68 % */
sysctl_tcp_mem[1] = limit; sysctl_tcp_mem[1] = limit; /* 6.25 % */
sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; sysctl_tcp_mem[2] = sysctl_tcp_mem[0] * 2; /* 9.37 % */
} }
void __init tcp_init(void) void __init tcp_init(void)