The following patchset contains changes for the master-backup synchronization mechanism. Patches 1-4 fix some flags and transmitter issues for the backup Patch 5 (use adaptive pause in master thread) changes the fixed pause of 1 HZ in master thread to adaptive pause, useful for setups that use v0 of the sync protocol or when persistence is used for v1 because the next patch changes the sync rate for persistence connections back to original method (sync templates every time when syncing controlled connections). Patch 6 (reduce sync rate with time thresholds) addresses the problem of high sync rate for loaded sites. With commit 986a075795339c5ea1122ce9290dfd5504252eb0 (Backup, Change sending to Version 1 format) we tried to reduce the sync rate for templates in protocol v1 but using sync_threshold for templates is too arbitrary and leads to inaccurate information in backup when the template life time is extended. This change restores the high rate of templates for the default case (using sync_threshold parameters) but adds new controls that can reduce the sync rate for all kind of connections: sync_refresh_period and sync_retries. Tests with sync_refresh_period=1000 can show 10 times lower sync traffic compared to sync_threshold=3 100. Patch 7 (add support for sync threads) addresses the problem that single thread in backup server is not suitable for high sync rate. For setups that use many masters and single backup or when the backup is used as master or real server at the same time we can prefer to serve the sync traffic on many CPUs. This patch adds sysctl var "sync_ports" and starts the specified number of threads (one thread per port). This value is used for master threads too. Patch 8 (optimize the use of flags in ip_vs_bind_dest) is just an optimization for the cp->flags usage. Special thanks to Aleksey Chudov <aleksey.chudov@xxxxxxxxx> for being patient with me, for his extensive reports and helping in all tests. Julian Anastasov (8): ipvs: ignore IP_VS_CONN_F_NOOUTPUT in backup server ipvs: remove check for IP_VS_CONN_F_SYNC from ip_vs_bind_dest ipvs: fix ip_vs_try_bind_dest to rebind app and transmitter ipvs: always update some of the flags bits in backup ipvs: use adaptive pause in master thread ipvs: reduce sync rate with time thresholds ipvs: add support for sync threads ipvs: optimize the use of flags in ip_vs_bind_dest include/linux/ip_vs.h | 5 + include/net/ip_vs.h | 59 ++++- net/netfilter/ipvs/ip_vs_conn.c | 69 ++++-- net/netfilter/ipvs/ip_vs_core.c | 30 +-- net/netfilter/ipvs/ip_vs_ctl.c | 54 ++++- net/netfilter/ipvs/ip_vs_sync.c | 585 +++++++++++++++++++++++++-------------- 6 files changed, 540 insertions(+), 262 deletions(-) -- 1.7.3.4 -- 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
