On Sat, Aug 21, 2021 at 11:41:50AM +0300, Julian Anastasov wrote: > > Hello, > > On Fri, 20 Aug 2021, Dust Li wrote: > > > estimation_timer will iterate the est_list to do estimation > > for each ipvs stats. When there are lots of services, the > > list can be very large. > > We found that estimation_timer() run for more then 200ms on a > > machine with 104 CPU and 50K services. > > > > yunhong-cgl jiang report the same phenomenon before: > > https://www.spinics.net/lists/lvs-devel/msg05426.html > > > > In some cases(for example a large K8S cluster with many ipvs services), > > ipvs estimation may not be needed. So adding a sysctl blob to allow > > users to disable this completely. > > > > Default is: 1 (enable) > > > > Cc: yunhong-cgl jiang <xintian1976@xxxxxxxxx> > > Signed-off-by: Dust Li <dust.li@xxxxxxxxxxxxxxxxx> > > Looks good to me, thanks! > > Acked-by: Julian Anastasov <ja@xxxxxx> Likwewise, thanks. And sorry for the delay. Acked-by: Simon Horman <horms@xxxxxxxxxxxx> Pablo, could you consider picking this up? > > --- > > v2: Use common sysctl facilities > > v3: Fix sysctl_run_estimation() redefine when CONFIG_SYSCTL not enabled > > v4: Some typo and minor fixes > > > > Documentation/networking/ipvs-sysctl.rst | 11 +++++++++++ > > include/net/ip_vs.h | 11 +++++++++++ > > net/netfilter/ipvs/ip_vs_ctl.c | 8 ++++++++ > > net/netfilter/ipvs/ip_vs_est.c | 5 +++++ > > 4 files changed, 35 insertions(+) > > > > diff --git a/Documentation/networking/ipvs-sysctl.rst b/Documentation/networking/ipvs-sysctl.rst > > index 2afccc63856e..95ef56d62077 100644 > > --- a/Documentation/networking/ipvs-sysctl.rst > > +++ b/Documentation/networking/ipvs-sysctl.rst > > @@ -300,3 +300,14 @@ sync_version - INTEGER > > > > Kernels with this sync_version entry are able to receive messages > > of both version 1 and version 2 of the synchronisation protocol. > > + > > +run_estimation - BOOLEAN > > + 0 - disabled > > + not 0 - enabled (default) > > + > > + If disabled, the estimation will be stop, and you can't see > > + any update on speed estimation data. > > + > > + You can always re-enable estimation by setting this value to 1. > > + But be careful, the first estimation after re-enable is not > > + accurate. > > diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h > > index 7cb5a1aace40..ff1804a0c469 100644 > > --- a/include/net/ip_vs.h > > +++ b/include/net/ip_vs.h > > @@ -931,6 +931,7 @@ struct netns_ipvs { > > int sysctl_conn_reuse_mode; > > int sysctl_schedule_icmp; > > int sysctl_ignore_tunneled; > > + int sysctl_run_estimation; > > > > /* ip_vs_lblc */ > > int sysctl_lblc_expiration; > > @@ -1071,6 +1072,11 @@ static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) > > return ipvs->sysctl_cache_bypass; > > } > > > > +static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) > > +{ > > + return ipvs->sysctl_run_estimation; > > +} > > + > > #else > > > > static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) > > @@ -1163,6 +1169,11 @@ static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) > > return 0; > > } > > > > +static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) > > +{ > > + return 1; > > +} > > + > > #endif > > > > /* IPVS core functions > > diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c > > index c25097092a06..cbea5a68afb5 100644 > > --- a/net/netfilter/ipvs/ip_vs_ctl.c > > +++ b/net/netfilter/ipvs/ip_vs_ctl.c > > @@ -2017,6 +2017,12 @@ static struct ctl_table vs_vars[] = { > > .mode = 0644, > > .proc_handler = proc_dointvec, > > }, > > + { > > + .procname = "run_estimation", > > + .maxlen = sizeof(int), > > + .mode = 0644, > > + .proc_handler = proc_dointvec, > > + }, > > #ifdef CONFIG_IP_VS_DEBUG > > { > > .procname = "debug_level", > > @@ -4090,6 +4096,8 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) > > tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode; > > tbl[idx++].data = &ipvs->sysctl_schedule_icmp; > > tbl[idx++].data = &ipvs->sysctl_ignore_tunneled; > > + ipvs->sysctl_run_estimation = 1; > > + tbl[idx++].data = &ipvs->sysctl_run_estimation; > > > > ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl); > > if (ipvs->sysctl_hdr == NULL) { > > diff --git a/net/netfilter/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c > > index 05b8112ffb37..9a1a7af6a186 100644 > > --- a/net/netfilter/ipvs/ip_vs_est.c > > +++ b/net/netfilter/ipvs/ip_vs_est.c > > @@ -100,6 +100,9 @@ static void estimation_timer(struct timer_list *t) > > u64 rate; > > struct netns_ipvs *ipvs = from_timer(ipvs, t, est_timer); > > > > + if (!sysctl_run_estimation(ipvs)) > > + goto skip; > > + > > spin_lock(&ipvs->est_lock); > > list_for_each_entry(e, &ipvs->est_list, list) { > > s = container_of(e, struct ip_vs_stats, est); > > @@ -131,6 +134,8 @@ static void estimation_timer(struct timer_list *t) > > spin_unlock(&s->lock); > > } > > spin_unlock(&ipvs->est_lock); > > + > > +skip: > > mod_timer(&ipvs->est_timer, jiffies + 2*HZ); > > } > > > > -- > > 2.19.1.3.ge56e4f7 > > > > > > > > Regards > > -- > Julian Anastasov <ja@xxxxxx> >
