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Subject: Re: Strange results of TP-Link WDR3600 wired ethernet performace test
To: Adrian Chadd <adrian.chadd@gmail.com>
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From: Eugene Grosbein <eugen@grosbein.net>
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Date: Tue, 27 Oct 2015 19:40:01 +0700
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On 27.10.2015 00:49, Adrian Chadd wrote:
> Hi,
> 
> I'm glad that the throughput is higher - I was expecting exactly that.
> 
> The interrupt storm - not sure. I haven't reproduced that at home.
> There's some bit(s) in the interrupt status register that don't seem
> to be cleared by taking action. I don't know what they are yet.

To be precise: first it forwards traffic just fine, without interrupt storm
and speed may raise over 22MByte/s but after a minute or less,
interrupt storm begins. By default, hw.intr_storm_threshold is 1000
and it does not help increasing it upto 100,000. If I set it to zero
(disable throttling), the device locks up solid when storm occurs:
no traffic forwarding, no ping replies, even console is dead.
Power cycle is required to revive it. This is 100% repeatable.

I have PMC (performance monitoring counters) compiled in kernel.
Now can I try to debug this?