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

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

The following reply was made to PR kern/57049; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: Frank Kardel <kardel%netbsd.org@localhost>
Cc: gnats-bugs%netbsd.org@localhost, kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/57049: large TCP transfers NetBSD-Xen-Guest ->
 NetBSD-Xen-DOM0 abort with EHOSTDOWN
Date: Fri, 7 Oct 2022 17:07:37 +0200

 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
 --