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38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
From 695ab2e89334c7c472fada130938fdd8bd3b133a Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Sat, 27 May 2017 19:02:06 +0200
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Subject: [PATCH 137/414] net/core: disable NET_RX_BUSY_POLL
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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sk_busy_loop() does preempt_disable() followed by a few operations which can
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take sleeping locks and may get long.
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I _think_ that we could use preempt_disable_nort() (in sk_busy_loop()) instead
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but after a successfull cmpxchg(&napi->state, …) we would gain the ressource
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and could be scheduled out. At this point nobody knows who (which context) owns
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it and so it could take a while until the state is realeased and napi_poll()
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could be invoked again.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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net/Kconfig | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/net/Kconfig b/net/Kconfig
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index 9dba2715919d..9c7b38379c09 100644
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -272,7 +272,7 @@ config CGROUP_NET_CLASSID
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config NET_RX_BUSY_POLL
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bool
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- default y
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+ default y if !PREEMPT_RT_FULL
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config BQL
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bool
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--
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2.18.0
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