From 0a33bdce34c68f1d158d2ee3c9dfd011bef5c290 Mon Sep 17 00:00:00 2001 From: Ismael Luceno Date: Thu, 2 Jul 2026 12:10:50 +0200 Subject: [PATCH] ipvs: Move defense_work and est_reload_work to system_dfl_long_wq Under synflood conditions binding these handlers to system_long_wq may pin them to a saturated CPU. We've observed improved throughtput on a DPDK/VPP application with this change, which we attribute to the reduced context switching. Neither handler has per-CPU data dependencies nor cache locality requirements that would prevent this change. Signed-off-by: Ismael Luceno Acked-by: Julian Anastasov Signed-off-by: Pablo Neira Ayuso --- net/netfilter/ipvs/ip_vs_ctl.c | 6 +++--- net/netfilter/ipvs/ip_vs_est.c | 2 +- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index bcf40b8c41cf..d7e669efab4d 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -235,7 +235,7 @@ static void defense_work_handler(struct work_struct *work) update_defense_level(ipvs); if (atomic_read(&ipvs->dropentry)) ip_vs_random_dropentry(ipvs); - queue_delayed_work(system_long_wq, &ipvs->defense_work, + queue_delayed_work(system_dfl_long_wq, &ipvs->defense_work, DEFENSE_TIMER_PERIOD); } #endif @@ -290,7 +290,7 @@ static void est_reload_work_handler(struct work_struct *work) atomic_set(&ipvs->est_genid_done, genid); if (repeat) - queue_delayed_work(system_long_wq, &ipvs->est_reload_work, + queue_delayed_work(system_dfl_long_wq, &ipvs->est_reload_work, delay); unlock: @@ -5126,7 +5126,7 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) goto err; /* Schedule defense work */ - queue_delayed_work(system_long_wq, &ipvs->defense_work, + queue_delayed_work(system_dfl_long_wq, &ipvs->defense_work, DEFENSE_TIMER_PERIOD); return 0; diff --git a/net/netfilter/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c index ab09f5182951..78964aa861e9 100644 --- a/net/netfilter/ipvs/ip_vs_est.c +++ b/net/netfilter/ipvs/ip_vs_est.c @@ -243,7 +243,7 @@ void ip_vs_est_reload_start(struct netns_ipvs *ipvs, bool restart) /* Bump the kthread configuration genid if stopping is requested */ if (restart) atomic_inc(&ipvs->est_genid); - queue_delayed_work(system_long_wq, &ipvs->est_reload_work, 0); + queue_delayed_work(system_dfl_long_wq, &ipvs->est_reload_work, 0); } /* Start kthread task with current configuration */