11.1 running on HyperV hn interface hangs

[Sepherosa Ziehau]

Ignore ths hn_dec_txdesc.diff, please try this done; should be more effective:
https://people.freebsd.org/~sephe/hn_inc_txbr.diff

On Thu, Sep 7, 2017 at 10:22 AM, Sepherosa Ziehau <sephe at freebsd.org> wrote:
> Is it possible to tell me your workload?  e.g. TX heavy or RX heavy.
> Enabled TSO or not.  Details like how the send syscalls are issue will
> be interesting.  And your Windows version, include the patch level,
> etc.
>
> Please try the following patch:
> https://people.freebsd.org/~sephe/hn_dec_txdesc.diff
>
> Thanks,
> sephe
>
>
> On Wed, Sep 6, 2017 at 11:23 PM, Julian Elischer <julian at freebsd.org> wrote:
>> On 6/9/17 7:02 pm, Pete French wrote:
>>>>
>>>> We recently moved our software from 11.0-p9 to 11.1-p1, but looks like
>>>> there
>>>> is a regression in 11.1-p1 running on HyperV (Windows/HyperV 2012 R2)
>>>> where
>>>> the virtual hn0 interface hangs with the following kernel messages:
>>>>
>>>>   hn0: <Hyper-V Network Interface> on vmbus0
>>>>   hn0: Ethernet address: 00:15:5d:31:21:0f
>>>>   hn0: link state changed to UP
>>>>   ...
>>>>   hn0: RXBUF ack retry
>>>>   hn0: RXBUF ack failed
>>>>   last message repeated 571 times
>>>>
>>>> It requires a restart of the HyperV VM.
>>>>
>>>> This is a customer production server (remote customer ~4000km away)
>>>> running
>>>> fairly critical monitoring software, so we needed to roll it back to
>>>> 11.0-p9.
>>>> We only have two customers running our software in HyperV, vs lots in
>>>> VMware
>>>> and a handful on physical hardware.
>>>>
>>>> 11.0-p9 has been very stable.  Has anyone seen this problem before with
>>>> 11.1 ?
>>>
>>>
>>>
>>> I don't run anything on local hyper-v anymore, but I do run a ot of stuff
>>> in Azure, and we havent seen anything like this. I track STABLE for things
>>> though, updating after reading the commits and testing locally for a week or
>>> so, so the version I am running currently is r320175, which was part of
>>> 11.1-BETA2. I am going to upgrade to a more recent STABLE sometime this weke
>>> or next though, will do that on a test amchine and let you now how it goes.
>>>
>>> I seem to recall that there were some large changes to the hn code in
>>> August to add virtual function support. When does 11.1-p1 date from ?
>>
>> make sure you contact the FreeBSD/Microsoft guys.  Very responsive.. don't
>> know if they watch -stable..
>> I'll cc a couple..
>>
>>>
>>> -pete.
>>> _______________________________________________
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>>>
>>
>
>
>
> --
> Tomorrow Will Never Die



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