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Re: Python 2 and test/vm/netbsd
From: |
Samuel Thibault |
Subject: |
Re: Python 2 and test/vm/netbsd |
Date: |
Fri, 18 Oct 2019 18:00:19 +0200 |
User-agent: |
NeoMutt/20170609 (1.8.3) |
Philippe Mathieu-Daudé, le ven. 18 oct. 2019 16:58:00 +0200, a ecrit:
> On 10/18/19 4:29 PM, Eduardo Habkost wrote:
> > On Fri, Oct 18, 2019 at 12:44:39PM +0200, Gerd Hoffmann wrote:
> > > Hi,
> > >
> > > > > Running with V=1, I see packages being downloaded at reasonable
> > > > > speeds, but
> > > > > there's a huge interval (of various minutes) between each package
> > > > > download.
> > > >
> > > > I've found the cause for the slowness I'm seeing: for each file
> > > > being downloaded, the guest spents at least 75 seconds trying to
> > > > connect to the IPv6 address of ftp.NetBSD.org, before trying
> > > > IPv4.
> > >
> > > Ah, that nicely explains why it worked just fine for me. First, I have
> > > a local proxy configured so the installer isn't going to connect to
> > > ftp.NetBSD.org directly. Second I have IPv6 connectivity.
> > >
> > > > I don't know if this is a NetBSD bug, or a slirp bug.
> > >
> > > Both I'd say ...
> > >
> > > First, by default slirp should not send IPv6 router announcements
> > > to the user network if the host has no IPv6 connectivity.
> > >
> > > Second, the recommended way to connect is to try ipv4 and ipv6 in
> > > parallel, then use whatever connects first. Web browsers typically
> > > do it that way. wget and curl don't do that though, they try one
> > > address after the other, and I guess this is where the delay comes
> > > from ...
> >
> > In addition to that, the connect() error should be generating a
> > ICMP6_UNREACH message, and I'd expect the NetBSD guest to notice
> > it instead of waiting for timeout.
>
> Is this missing in SLiRP?
It was implemented at the time of introduction of IPv6 in SLIRP. Perhaps
NetBSD has a slightly different behavior which makes the implementation
fail to notice the error.
Samuel
- Re: Python 2 and test/vm/netbsd, (continued)
- Re: Python 2 and test/vm/netbsd, Eduardo Habkost, 2019/10/16
- Re: Python 2 and test/vm/netbsd, Gerd Hoffmann, 2019/10/18
- Re: Python 2 and test/vm/netbsd, Eduardo Habkost, 2019/10/18
- Re: Python 2 and test/vm/netbsd, Philippe Mathieu-Daudé, 2019/10/18
- Re: Python 2 and test/vm/netbsd,
Samuel Thibault <=
- Re: Python 2 and test/vm/netbsd, Eduardo Habkost, 2019/10/18
- Re: Python 2 and test/vm/netbsd, Samuel Thibault, 2019/10/22
- Re: Python 2 and test/vm/netbsd, Kamil Rytarowski, 2019/10/22
- Re: Python 2 and test/vm/netbsd, Samuel Thibault, 2019/10/22