Re: kern/57049: large TCP transfers NetBSD-Xen-Guest -> NetBSD-Xen-DOM0 abort with EHOSTDOWN

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Oct 07, 2022 at 04:43:52PM +0200, Frank Kardel wrote:
> Hi Manuel,
> 
> that is probably because the DOMU is 9.2 which still had the classic ARP
> resolution code. In 9.99.x the ARP resolution
> 
> was replaced with a neighbour discovery derived code in nd.c. On Xen I
> tripped over this issue with a 99.100 GENERIC guest quickly. It may be that
> it
> 
> happens with other true network peers also, but I was not able to trigger it
> with a true network peer right away.

OK, with a HEAD domU I can reproduce this.
But I don't think this is Xen-specific. Maybe it's just some timing or
ressource issue that makes it more likely to happen on Xen.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--