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authorAbhimanyu <abhimanyu@freescale.com>2015-10-21 04:42:32 (GMT)
committerPriyanka Jain <Priyanka.Jain@freescale.com>2015-10-21 05:01:21 (GMT)
commit502650e09dd95d79ddbe24419409f7ef93818157 (patch)
tree2927fc5950b247d082836329ead74dd37070e44a /drivers
parente37ce255ffa6daf1cdda0b1472c8ca5f4aaaeae8 (diff)
downloadlinux-fsl-qoriq-502650e09dd95d79ddbe24419409f7ef93818157.tar.xz
net, rt: limit net_rx napi calls in threaded ISR context
-In a PREEMPT_RT with CONFIG_PREEMPT_RT_FULL configuration enabled, some of Interrupt Handler runs in context of threaded ISR. And if this threaded ISR raises a particular softirq, then that calls __raise_softirq_irqoff() function which mark the softirq ready to be executed while exiting ISR in context of ISR only. -So, net_rx_action() function is called in context of threaded ISR if NET_RX_SOFTIRQ softirq is raised by that particular ISR. -net_rx_action is balancing scheduling among napis by using time-out of 2 jiffies for particular napi. On timeout , it calls __raise_softirq_irqoff(). -In case of RT kernel, __raise_softirq_irqoff() again makes the NET_RX_SOFTIRQ ready. So it is called again and again until the packet ring is emptied.This creats a starvation condition for other threads. -This patch removes calling __raise_softirq_irqoff() again while exiting net_rx_action() Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com> Signed-off-by: Abhimanyu <abhimanyu@freescale.com>
Diffstat (limited to 'drivers')
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