From a38c4343dc64fa5da5989d72c3dec9b5ed521f3b Mon Sep 17 00:00:00 2001 From: Kirill Korotaev Date: Wed, 8 Nov 2006 08:12:01 +0100 Subject: [IPV4]: Limit rt cache size properly. During OpenVZ stress testing we found that UDP traffic with random src can generate too much excessive rt hash growing leading finally to OOM and kernel panics. It was found that for 4GB i686 system (having 1048576 total pages and 225280 normal zone pages) kernel allocates the following route hash: syslog: IP route cache hash table entries: 262144 (order: 8, 1048576 bytes) => ip_rt_max_size = 4194304 entries, i.e. max rt size is 4194304 * 256b = 1Gb of RAM > normal_zone Attached the patch which removes HASH_HIGHMEM flag from alloc_large_system_hash() call. Signed-off-by: David S. Miller Signed-off-by: Adrian Bunk --- net/ipv4/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/ipv4') diff --git a/net/ipv4/route.c b/net/ipv4/route.c index a67955e26371..c2cd901327bd 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -3153,7 +3153,7 @@ int __init ip_rt_init(void) rhash_entries, (num_physpages >= 128 * 1024) ? 15 : 17, - HASH_HIGHMEM, + 0, &rt_hash_log, &rt_hash_mask, 0); -- cgit v1.2.3