From owner-freebsd-mips@freebsd.org  Thu Oct 29 21:21:04 2015
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Subject: Re: arge1 on TL WDR3600
To: Adrian Chadd <adrian.chadd@gmail.com>
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Cc: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org>
From: Eugene Grosbein <eugen@grosbein.net>
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Date: Fri, 30 Oct 2015 04:20:49 +0700
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On 30.10.2015 04:15, Eugene Grosbein wrote:

> I do not think that hardware is buggy because several versions of "official"
> TP-Link firmware work just fine with this particular device and earlier
> versions of FreeBSD 11 also work without interrupt storms.
> 
> In fact, I've applied dichotomy and found guilty commit. It took 12 iterations
> but here is it: kernel built using head at r289897 runs my test without a storm
> (but forwarding speed is pretty bad) and kernel built with r289898 or later
> revisions has interrupt storm.
> 
> This is the change:
> https://svnweb.freebsd.org/base/head/sys/mips/atheros/if_arge.c?r1=289744&r2=289898&view=patch
> 
> My device has hw.model: Atheros AR9344 rev 2

Also, for slow but stable (pre-289898) revisions stats show that all tx packets
are unaligned:

dev.arge.0.tx_pkts_unaligned: 1189534
dev.arge.0.tx_pkts_aligned: 0

And, as I've already wrote, later revisions show opposite, like:

> dev.arge.0.tx_pkts_unaligned: 0
> dev.arge.0.tx_pkts_aligned: 345184

Hope this helps.