CONFIG_PREEMPT_SOFTIRQS

[Vinod KK <kkvinod@gmail.com>]

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/