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List:       linux-newbie
Subject:    CONFIG_PREEMPT_SOFTIRQS
From:       Vinod KK <kkvinod () gmail ! com>
Date:       2006-01-31 15:57:43
Message-ID: c2f233c10601310745p5111bd6are32bb66c9f381e6b () mail ! gmail ! com
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Hi,

I am using linux 2.6.10 (with Ingo Molnars real time patches) on my mips board.

When I try running high network traffic (10% traffic on a 100Mbps
link) on my target board with the CONFIG_PREEMPT_DESKTOP=y and
CONFIG_PREEMPT_SOFTIRQS=y options enabled I notice that the console
freezes and recovers only after the traffic stops. I do not notice
this behaviour with the CONFIG_PREEMPT_SOFTIRQS option disabled.

I understand that the CONFIG_PREEMPT_SOFTIRQS option puts all softirq
processing to the ksoftirqd daemon, but i do not see why this should
stall the console. I believe there should be some task which is
starving for CPU, but I do not know which one.

The console is on an 16550 serial port.

Could someone please give me some pointers on where I should start looking?

Thanks,
Vinod K.
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