lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[NETFILTER]: ULOG/nfnetlink_log: Use better default value for 'nlbufsiz'

Browse Source 
Performance tests showed that ULOG may fail on heavy loaded systems
because of failed order-N allocations (N >= 1).

The default value of 4096 is not optimal in the sense that it actually
allocates _two_ contigous physical pages.  Reasoning: ULOG uses
alloc_skb(), which adds another ~300 bytes for skb_shared_info.

This patch sets the default value to NLMSG_GOODSIZE and adds some
documentation at the top.

Signed-off-by: Holger Eitzenberger <heitzenberger@astaro.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Holger Eitzenberger
2006-02-04 02:13:14 -08:00
committed by David S. Miller
parent ddc8d029ac
commit c2db292438
3 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
net/bridge/netfilter/ebt_ulog.c
View File

@@ -46,7 +46,7 @@
#define PRINTR(format, args...) do { if (net_ratelimit()) \
printk(format , ## args); } while (0)
static unsigned int nlbufsiz = 4096;
static unsigned int nlbufsiz = NLMSG_GOODSIZE;
module_param(nlbufsiz, uint, 0600);
MODULE_PARM_DESC(nlbufsiz, "netlink buffer size (number of bytes) "
"(defaults to 4096)");