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

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
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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)");

6
net/ipv4/netfilter/ipt_ULOG.c
View File

@ -35,6 +35,10 @@
* each nlgroup you are using, so the total kernel memory usage increases
* by that factor.
*
* Actually you should use nlbufsiz a bit smaller than PAGE_SIZE, since
* nlbufsiz is used with alloc_skb, which adds another
* sizeof(struct skb_shared_info). Use NLMSG_GOODSIZE instead.
*
* flushtimeout:
* Specify, after how many hundredths of a second the queue should be
* flushed even if it is not full yet.
@ -76,7 +80,7 @@ MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NFLOG);
#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, 0400);
MODULE_PARM_DESC(nlbufsiz, "netlink buffer size");

2
net/netfilter/nfnetlink_log.c
View File

@ -37,7 +37,7 @@
#include "../bridge/br_private.h"
#endif
#define NFULNL_NLBUFSIZ_DEFAULT 4096
#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
#define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */