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ipvs: Move defense_work and est_reload_work to system_dfl_long_wq

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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 <iluceno@suse.de>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ismael Luceno
2026-07-02 12:10:50 +02:00
committed by Pablo Neira Ayuso
parent 89d8006259
commit 0a33bdce34
2 changed files with 4 additions and 4 deletions
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6
net/netfilter/ipvs/ip_vs_ctl.c
View File

@@ -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;

2
net/netfilter/ipvs/ip_vs_est.c
View File

@@ -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 */