linux-kernel - Re: 4.9.28: VIA velocity hang: how to find cause?

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Message-ID: <d1c7f2ea-cfaa-218b-e08e-b67c47223f49@xs4all.nl>
Date:   Thu, 25 May 2017 13:52:08 +0200
From:   Udo van den Heuvel <udovdh@...all.nl>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 4.9.28: VIA velocity hang: how to find cause?

Hello,

Forcing the VIA Velocity interface to 1000 Mbps FDX appears to help a
bit but still the connection stops transferring data after a while.
I added some printk's and in or after velocity_tx_service it ends.

Where should I focus with my debug printk's?

It appears I can reproduce the issue by running a `find /` over ssh to
the box. So perhaps it is an interrupt related issue?

Please help find the root cause.

Kind regards,
Udo

On 24-05-17 15:04, Udo van den Heuvel wrote:
> Hello,
> 
> This issue occurs on VIA Epia M910E.
> Both interfaces suffer from this.
> Setting msglvl with ethtool has no effect on the info the driver
> provides on any issues.
> So how to proceed from here?
> If this is a software issue, which I cannot determine, the driver is
> useless in its present state.
> 
> Kind regards,
> Udo
> 
> On 23-05-17 18:07, Udo van den Heuvel wrote:
>> Hello,
>>
>> I noticed multiple times that VIA velocity interface stop functioning
>> without reason but is revived after and `ifdown ethX; ifup ethX`.
>> No data is transferred until the `fix` is applied.
>> No errors are shown in dmesg or /var/log/messages w.r.t. the interface.
>> How to find the root cause?
>>
>> This is with kernel 4.9.28.
>>
>> Kind regards,
>> Udo
>>
>