Hi Andy,
Yes, the original sychronziation design is a sort of arbitary or
compromised solution. We don't want to synchronize every state change from
master to backup load balancer, because we were afraid that there were too
much state change synchronization messages and there would be some
performance penalty. So, we only sychronize the connection of TCP
ESTABLISHED state or UDP to backup load balancer, and use the timeout of 3
minutes.
Your change is probably ok, but we should be aware that it may create a
lot of connection entries at backup load balancer for TCP applications,
which is much more than that at master load balancer, because there is no
connection close synchronization and timeout is changed to 3 minutes to 15
minutes.
The simple solution is probably to make timeout value tuneable, so that
users can tune it for their application. The better solution is to
synchronize very connection state change from master to backup, so that
backup have almost the same state of connections.
Thanks,
Wensong
On Thu, 4 May 2006, Andy Gospodarek wrote:
Instead of using the default timeout of 3 minutes, this uses the timeout
specific to the protocol used for the connection. The 3 minute timeout
seems somewhat arbitrary (though I know it is used other places in the
ipvs code) and when failing over it would be much nicer to use one of
the configured timeout values.
Signed-off-by: Andy Gospodarek <[EMAIL PROTECTED]>
---
ip_vs_sync.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/ipv4/ipvs/ip_vs_sync.c
@@ -67,7 +67,6 @@ struct ip_vs_sync_conn_options {
struct ip_vs_seq out_seq; /* outgoing seq. struct */
};
-#define IP_VS_SYNC_CONN_TIMEOUT (3*60*HZ)
#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn))
#define FULL_CONN_SIZE \
(sizeof(struct ip_vs_sync_conn) + sizeof(struct ip_vs_sync_conn_options))
@@ -279,6 +278,7 @@ static void ip_vs_process_message(const
struct ip_vs_sync_conn *s;
struct ip_vs_sync_conn_options *opt;
struct ip_vs_conn *cp;
+ struct ip_vs_protocol *pp;
char *p;
int i;
@@ -337,7 +337,8 @@ static void ip_vs_process_message(const
p += SIMPLE_CONN_SIZE;
atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]);
- cp->timeout = IP_VS_SYNC_CONN_TIMEOUT;
+ pp = ip_vs_proto_get(s->protocol);
+ cp->timeout = pp->timeout_table[cp->state];
ip_vs_conn_put(cp);
if (p > buffer+buflen) {
-
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