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Add two loader tuneables that allow one to change the maximum number of 

queue items that can be allocated by netgraph and the number of free queue
items that are cached on a private list.

Netgraph places an upper limit on the number of queue items it may allocate.
When there is a large number of netgraph messages travelling through the
system (100k/sec and more) there is a high probability, that messages get
queued at the nodes and netgraph runs out of queue items. In this case the data
flow through netgraph gets blocked. The tuneable for the number of free
items lets one trade memory for performance.

The tunables are also available as read-only sysctls.

PR:		kern/47393
Reviewed by:	julian
Approved by:	jake (mentor)
This commit is contained in:
Hartmut Brandt 2003-03-02 18:04:10 +00:00
parent 521f364b80
commit 5dfe609dd1
2 changed files with 13 additions and 1 deletions
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2
sys/boot/forth/loader.conf
View File

@ -102,6 +102,8 @@ module_path="/boot/kernel;/boot/modules;/modules" # Set the module search path
#debug.ktr.cpumask="0xf" # Bitmask of CPUs to enable KTR on
#debug.ktr.mask="0x1200" # Bitmask of KTR events to enable
#debug.ktr.verbose="1" # Enable console dump of KTR events
#net.graph.maxalloc="128" # Maximum number of queue items to allocate
#net.graph.ngqfreemax="64" # Maximum number of free queue items to cache
##############################################################

12
sys/netgraph/ng_base.c
View File

@ -3017,8 +3017,18 @@ SYSCTL_INT(_net_graph, OID_AUTO, msg_version, CTLFLAG_RD, 0, NG_VERSION, "");
static int allocated; /* number of items malloc'd */
static int maxalloc = 128; /* limit the damage of a leak */
static const int ngqfreemax = 64;/* cache at most this many */
static int ngqfreemax = 64;/* cache at most this many */
TUNABLE_INT("net.graph.maxalloc", &maxalloc);
SYSCTL_INT(_net_graph, OID_AUTO, maxalloc, CTLFLAG_RD, &maxalloc,
0, "Maximum number of queue items to allocate");
TUNABLE_INT("net.graph.ngqfreemax", &ngqfreemax);
SYSCTL_INT(_net_graph, OID_AUTO, ngqfreemax, CTLFLAG_RD, &ngqfreemax,
0, "Maximum number of free queue items to cache");
static const int ngqfreelow = 4; /* try malloc if free < this */
static volatile int ngqfreesize; /* number of cached entries */
#ifdef NETGRAPH_DEBUG