netdev - Re: am335x: cpsw: interrupt failure

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Message-ID: <54A15B48.9010407@hurleysoftware.com>
Date:	Mon, 29 Dec 2014 08:46:48 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Yegor Yefremov <yegorslists@...glemail.com>,
	Felipe Balbi <balbi@...com>
CC:	netdev <netdev@...r.kernel.org>,
	"N, Mugunthan V" <mugunthanvnm@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: am335x: cpsw: interrupt failure

On 12/29/2014 04:33 AM, Yegor Yefremov wrote:
> On Fri, Dec 12, 2014 at 8:19 PM, Yegor Yefremov
> <yegorslists@...glemail.com> wrote:
>> On Fri, Dec 12, 2014 at 6:32 PM, Felipe Balbi <balbi@...com> wrote:
>>> Hi,
>>>
>>> On Fri, Dec 12, 2014 at 01:00:51PM +0100, Yegor Yefremov wrote:
>>>> U-Boot version: 2014.07
>>>> Kernel config is omap2plus with enabled USB
>>>>
>>>> # cat /proc/version
>>>> Linux version 3.18.0 (user@...r-VirtualBox) (gcc version 4.8.3
>>>> 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #6 SMP
>>>> Mon Dec 8 22:47:43 CET 2014
>>>
>>> Wasn't GCC 4.8.x total crap for building ARM kernels ? IIRC it was even
>>> blacklisted. Can you try with 4.9.x just to make sure ?
>>
>> Will do.
> 
> Adding linux-omap. Beginning of this discussion:
> http://comments.gmane.org/gmane.linux.network/341427
> 
> Quick summary: starting with kernel 3.18 or commit
> 55601c9f24670ba926ebdd4d712ac3b177232330 am335x (at least BBB and some
> custom boards) stalls at high network load. Reproducible via nuttcp
> within some minutes
> 
> nuttcp -S (on BBB)
> nuttcp -t -N 4 -T30m 192.168.1.235 (on host)
> 
> As Felipe Balbi suggested, I tried both 4.8.3 and 4.9.2 toolchains,
> but both show the same behavior.
> 
> Linux version 3.18.0 (user@...r-VirtualBox) (gcc version 4.8.3
> 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29) ) #6 SMP
> Mon Dec 8 22:47:43 CET 2014
> Linux version 3.18.1 (user@...r-VirtualBox) (gcc version 4.9.2
> (Buildroot 2015.02-git-00582-g10b9761) ) #1 SMP Mon Dec 29 09:22:29
> CET 2014
> 
> Let me know, if you can reproduce this issue.

I have seen the irq 0 error messages on the black since 3.18+, but didn't
bisect it yet. For me, these errors occurred with a slightly misconfigured
emacs24-nox, which drove the cpu load way up - over 50% - with just
cursor movement (it still gets above 20% which seems unacceptably high).

I'm not sure if all the crashes were over ssh; I hadn't considered
the cpsw relevant until reading this. I'll retest over the serial console.

I have seen abrupt resets without messages on earlier kernels so perhaps
the commit is not the root cause.

Regards,
Peter Hurley

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