@@ -232,6 +232,21 @@ config IP_VS_NQ
If you want to compile it in kernel, say Y. To compile it as a
module, choose M here. If unsure, say N.
+comment 'IPVS SH scheduler'
+
+config IP_VS_SH_TAB_BITS
+ int "IPVS source hashing table size (the Nth power of 2)"
+ range 4 20
+ default 8
+ ---help---
+ The source hashing scheduler maps source IPs to destinations
+ stored in a hash table. This table is tiled by each destination
+ until all slots in the table are filled. When using weights to
+ allow destinations to receive more connections, the table is
+ tiled an amount proportional to the weights specified. The table
+ needs to be large enough to effectively fit all the destinations
+ multiplied by their respective weights.
+
comment 'IPVS application helper'
config IP_VS_FTP
@@ -30,6 +30,11 @@
* server is dead or overloaded, the load balancer can bypass the cache
* server and send requests to the original server directly.
*
+ * The weight destination attribute can be used to control the
+ * distribution of connections to the destinations in servernode. The
+ * greater the weight, the more connections the destination
+ * will receive.
+ *
*/
#define KMSG_COMPONENT "IPVS"
@@ -99,9 +104,11 @@ ip_vs_sh_assign(struct ip_vs_sh_bucket *tbl, struct ip_vs_service *svc)
struct ip_vs_sh_bucket *b;
struct list_head *p;
struct ip_vs_dest *dest;
+ int d_count;
b = tbl;
p = &svc->destinations;
+ d_count = 0;
for (i=0; i<IP_VS_SH_TAB_SIZE; i++) {
if (list_empty(p)) {
b->dest = NULL;
@@ -113,14 +120,23 @@ ip_vs_sh_assign(struct ip_vs_sh_bucket *tbl, struct ip_vs_service *svc)
atomic_inc(&dest->refcnt);
b->dest = dest;
- p = p->next;
+ IP_VS_DBG_BUF(6, "assigned i: %d dest: %s weight: %d\n",
+ i, IP_VS_DBG_ADDR(svc->af, &dest->addr),
+ atomic_read(&dest->weight));
+
+ /* Don't move to next dest until filling weight */
+ if (++d_count >= atomic_read(&dest->weight)) {
+ p = p->next;
+ d_count = 0;
+ }
+
}
b++;
}
+
return 0;
}
-
/*
* Flush all the hash buckets of the specified table.
*/
Modify the algorithm to build the source hashing hash table to add extra slots for destinations with higher weight. This has the effect of allowing an IPVS SH user to give more connections to hosts that have been configured to have a higher weight. Signed-off-by: Michael Maxim <mike@okcupid.com> --- net/netfilter/ipvs/Kconfig | 15 +++++++++++++++ net/netfilter/ipvs/ip_vs_sh.c | 20 ++++++++++++++++++-- 2 files changed, 33 insertions(+), 2 deletions(-)