| From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| Date: Sat, 27 May 2017 19:02:06 +0200 |
| Subject: net/core: disable NET_RX_BUSY_POLL |
| |
| sk_busy_loop() does preempt_disable() followed by a few operations which can |
| take sleeping locks and may get long. |
| I _think_ that we could use preempt_disable_nort() (in sk_busy_loop()) instead |
| but after a successfull cmpxchg(&napi->state, …) we would gain the ressource |
| and could be scheduled out. At this point nobody knows who (which context) owns |
| it and so it could take a while until the state is realeased and napi_poll() |
| could be invoked again. |
| |
| Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| --- |
| net/Kconfig | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/net/Kconfig |
| +++ b/net/Kconfig |
| @@ -277,7 +277,7 @@ config CGROUP_NET_CLASSID |
| |
| config NET_RX_BUSY_POLL |
| bool |
| - default y |
| + default y if !PREEMPT_RT_FULL |
| |
| config BQL |
| bool |
