On Thu, May 12, 2016 at 5:22 PM, 'Roger Pau Monné' (roger....@citrix.com) <
roger....@citrix.com> wrote:

> On Thu, May 12, 2016 at 02:13:03PM +0000, Stephen Jones wrote:
> > Roger writes:
> >
> > > I think I have found what's causing the issue, but I don't have a
> NetBSD
> > > Dom0 in order to test the fix, could some of you please test the
> following patch and report back:
> > >
> > >
> > >
> https://people.freebsd.org/~royger/0001-xen-netfront-fix-feature-detection.patch
> > >
> > > It should apply cleanly against FreeBSD HEAD.
> >
> > --- a/sys/dev/xen/netfront/netfront.c
> > +++ b/sys/dev/xen/netfront/netfront.c
> > @@ -2016,7 +2016,7 @@ xn_query_features(struct netfront_info *np)
> >       device_printf(np->xbdev, "backend features:");
> >
> >       if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
> > -             "feature-sg", NULL, "%d", &val) < 0)
> > +             "feature-sg", NULL, "%d", &val) != 0)
> >               val = 0;
> >
> >       np->maxfrags = 1;
> > @@ -2026,7 +2026,7 @@ xn_query_features(struct netfront_info *np)
> >       }
> >
> >       if (xs_scanf(XST_NIL, xenbus_get_otherend_path(np->xbdev),
> > -             "feature-gso-tcpv4", NULL, "%d", &val) < 0)
> > +             "feature-gso-tcpv4", NULL, "%d", &val) != 0)
> >               val = 0;
> >
> >       np->xn_ifp->if_capabilities &= ~(IFCAP_TSO4|IFCAP_LRO);
> >
> > FreeBSD freebsd 11.0-CURRENT FreeBSD 11.0-CURRENT #1: Thu May 12
> 13:48:47 UTC 2016     root@freebsd:/usr/src/sys/amd64/compile/SDF  amd64
> >
> > xn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >       options=3<RXCSUM,TXCSUM>
> >       ether 00:16:3e:00:00:30
> >       inet 192.94.73.150 netmask 0xffffff00 broadcast 192.94.73.255
> >       nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> >       media: Ethernet manual
> >       status: active
> >
> > xn0: <Virtual Network Interface> at device/vif/0 on xenbusb_front0
> > xn0: Ethernet address: 00:16:3e:00:00:30
> > xn0: backend features:
> > xn0: link state changed to DOWN
> > xn0: link state changed to UP
> >
> > Indeed this does fix the issue.  I am now able to ssh into a FreeBSD 11
> DOMU running on a NetBSD DOM0.
> > I've done some basic in/out transfers over sftp and rates look good, no
> errors.
> >
> > Thank you for putting in an effort to get this working.  I hope that
> your diff will be incorporated quickly into
> > FreeBSD 11 and backported where that can be done.
>
> Done, it's committed to HEAD:
>
> https://svnweb.freebsd.org/base?view=revision&revision=299542
>
> And I plan to backport it to stable/10 in 3 days.
>
> Thanks for testing it!
>
>
FYI I patch local 10.3 system and works fine as expected, with better
network performance then 9.3

At least according to iperf3
Connecting to host 10.x.x.x, port 5201
[  4] local 10.x.x.67 port 54607 connected to 10.x.x.x port 5201
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec   177 MBytes  1.48 Gbits/sec    0   94.0 MBytes

[  4]   1.00-2.00   sec   192 MBytes  1.61 Gbits/sec    0    138 MBytes

[  4]   2.00-3.00   sec   200 MBytes  1.68 Gbits/sec    0    186 MBytes

[  4]   3.00-4.00   sec   222 MBytes  1.86 Gbits/sec    0    230 MBytes

[  4]   4.00-5.00   sec   227 MBytes  1.91 Gbits/sec    0    274 MBytes

[  4]   5.00-6.00   sec   209 MBytes  1.75 Gbits/sec    0    318 MBytes

[  4]   6.00-7.00   sec   212 MBytes  1.78 Gbits/sec    0    366 MBytes

[  4]   7.00-8.00   sec   215 MBytes  1.81 Gbits/sec    0    389 MBytes

[  4]   8.00-9.00   sec   220 MBytes  1.85 Gbits/sec    0    452 MBytes

[  4]   9.00-10.00  sec   235 MBytes  1.97 Gbits/sec    0    489 MBytes

- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  2.06 GBytes  1.77 Gbits/sec    0             sender
[  4]   0.00-10.00  sec  2.06 GBytes  1.77 Gbits/sec
 receiver


On 9 the max I could get was 700Mb/sec (host to guest) so this is pretty
nice :)

Many thanks for the fix Roger

Roger.
>
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