Messages in this thread Patch in this message | | | Date | Fri, 16 Feb 2024 12:02:15 -0300 | From | Marcelo Tosatti <> | Subject | [PATCH] net/core/dev.c: enable timestamp static key if CPU isolation is configured |
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For systems that use CPU isolation (via nohz_full), creating or destroying a socket with timestamping (SOF_TIMESTAMPING_OPT_TX_SWHW) might cause a static key to be enabled/disabled. This in turn causes undesired IPIs to isolated CPUs.
So enable the static key unconditionally, if CPU isolation is enabled, thus avoiding the IPIs.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/net/core/dev.c b/net/core/dev.c index 0d548431f3fa..cc9a77b4aa4e 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -153,6 +153,7 @@ #include <linux/prandom.h> #include <linux/once_lite.h> #include <net/netdev_rx_queue.h> +#include <linux/sched/isolation.h> #include "dev.h" #include "net-sysfs.h" @@ -11601,3 +11602,14 @@ static int __init net_dev_init(void) } subsys_initcall(net_dev_init); + +static int __init net_dev_late_init(void) +{ + /* avoid static key IPIs to isolated CPUs */ + if (housekeeping_enabled(HK_TYPE_MISC)) + net_enable_timestamp(); + + return 0; +} + +late_initcall(net_dev_late_init);
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