11.1 running on HyperV hn interface hangs

[Sepherosa Ziehau]

On Fri, Sep 29, 2017 at 12:36 PM, Paul Koch <paul.koch at akips.com> wrote:
> On Thu, 14 Sep 2017 09:54:56 +0800
> Sepherosa Ziehau <sephe at freebsd.org> wrote:
>
>> If you have any updates on this, please let me know.  There is still
>> time for 10.4.
>
> We are still playing around with this in the lab...
>
> Running similar setup as the customer
>  Microsoft Windows Server 2012 R2 Datacentre (6.3.9600) Revision 16384
>  Hyper-V 2012
>
> Two VM guests
>  - 11.0-RELEASE
>  - 11.1-p1
>
> We can not get the Hyper-V hn interface to lock up like the customer can
> though.
>
> We can get the VMs to hang/stall regularly if the guests run ntpd - approx
> every 15 mins, but no real obvious pattern to it.  Disabling ntpd fixes it.

Hmm, by ntpd I think you mean ntp client?  You will have to disable
timesync if you run ntp client:
sysctl hw.hvtimesync.sample_thresh=-1
sysctl hw.hvtimesync.ignore_sync=1

They interfere w/ each other.

Or do you mean the network hanging triggered by "RXBUF ack failed"?

Thanks,
sephe


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