Hello, On Sat, 22 Jun 2013, Aleksey Chudov wrote: > > From: Julian Anastasov <ja@xxxxxx> > > [PATCH] ipvs: add sync_persist_mode flag > > > > Add sync_persist_mode flag to reduce sync traffic > > by syncing only persistent templates. > > > > > > I tested the changes on one pair of LAN servers. After turning on > sync_persist_mode synchronization traffic decreased by 4 times! Also on LVS > Backup I can see only persist connections. Thanks! Can we assume that you have small number of connections from every client? 1-2 per IP? Or a small sync_refresh_period value is used? Can you show all these sync* sysctl parameters that were used? > First of all the Kernel on both servers have been updated. Then LVS Backup has > been rebooted to drop all connections. After the reboot sync was disabled and > all connections counters was zero. When I enabled sync again almost all > persist connections from LVS Master have been synced to LVS Backup. But also I > can see 0.04% of the connections in ESTABLISHED state, although they should > not be there! After disabling sync all connections on LVS Backup completely > disappear after about 5 minutes. Is it possible some of your services to be with persistence disabled? Because the sync_persist_mode=1 mode will not affect non-persistent services - their synchronisation should work as before. You can also try to grep for such established conns: # Find such ESTABLISHED conns grep ESTAB ip_vs_conn # and see what kind of conns we have from such client IPs, do # we have persistence templates, etc. grep client_ip ip_vs_conn > After turning on sloppy_tcp IP address have been moved from LVS Master to LVS > Backup. According to our statistics, most on clients remained on the same real > servers. I don't see any problems with sloppy_tcp. So, at least sloppy_tcp appears to work :) Regards -- Julian Anastasov <ja@xxxxxx> -- To unsubscribe from this list: send the line "unsubscribe lvs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
