Messages in this thread Patch in this message | | | Date | Mon, 21 Aug 2006 11:46:03 -0700 | From | Greg KH <> | Subject | [patch 03/20] Kill HASH_HIGHMEM from route cache hash sizing |
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-stable review patch. If anyone has any objections, please let us know.
------------------ From: Kirill Korotaev <dev@sw.ru>
[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 <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- net/ipv4/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- linux-2.6.17.8.orig/net/ipv4/route.c +++ linux-2.6.17.8/net/ipv4/route.c @@ -3144,7 +3144,7 @@ int __init ip_rt_init(void) rhash_entries, (num_physpages >= 128 * 1024) ? 15 : 17, - HASH_HIGHMEM, + 0, &rt_hash_log, &rt_hash_mask, 0); -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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