User: Password:
|
|
Subscribe / Log in / New account

linux.conf.au 2013 videos online

linux.conf.au 2013 videos online

Posted Feb 7, 2013 20:52 UTC (Thu) by intgr (subscriber, #39733)
In reply to: linux.conf.au 2013 videos online by PaulWay
Parent article: linux.conf.au 2013 videos online

> Anything that can overload the gigabit links between that machine and AARNET deserves special praise - or special attention... :-)

I don't know what the problem is, but every year when linux.conf.au posts their videos online, it's extremely difficult to get them to cross the oceans to Europe. Maybe it's the servers, or maybe the particular backbones that commodity ISPs use are too overloaded/throttled, possibly some other reason I can't think of. I've seen many other people complaining, too.

Why are they always hosted exclusively on one Australian server with no official mirrors, in Australia or anywhere else?

It's also incredibly annoying that they have a *misconfigured* IPv6 address on this host, which occasionally but rarely responds with an ICMP "Address unreachable". This is why people can't adopt IPv6.

I'd like to blame them for global warming, too, but I feel I should stop here. ;)


(Log in to post comments)

linux.conf.au 2013 videos online

Posted Feb 7, 2013 22:01 UTC (Thu) by PaulWay (subscriber, #45600) [Link]

I don't know the answers to those questions, intgr - I'm not one of the admins of the box, I'm just uploading the videos this year :-)

As the conference is frequently at an Australian University, they usually have a direct link to mirror.linux.org.au which is hosted at the Australian National University on AARNET. There are several other mirrors from there, including mirror.internode.on.net that I know of, within Australian. I'm not sure of the full arrangements, not being in that particular loop. I'd imagine they'd welcome other mirrors though :-)

I'll pass on the information about the IPv6 problem and see if the admins can fix that.

Thanks,

Paul

linux.conf.au 2013 videos online

Posted Feb 7, 2013 22:17 UTC (Thu) by intgr (subscriber, #39733) [Link]

> I don't know the answers to those questions, intgr

Sorry, I didn't mean to address you personally, I was just ranting while waiting for a video to download. :)

> There are several other mirrors from there, including mirror.internode.on.net

Thanks, unfortunately it doesn't seem to have LCA 2013 yet: http://mirror.internode.on.net/pub/linux.conf.au/

linux.conf.au 2013 videos online

Posted Feb 12, 2013 23:23 UTC (Tue) by gdt (subscriber, #6284) [Link]

it's extremely difficult to get them to cross the oceans to Europe

Almost certainly a host TCP tuning issue. Australia is a long way and the default Linux TCP buffers are for North America where resources are a lot closer than 200ms. Moments ago I got 120Mbps downloading a video, that probably reflects the sustained I/O throughput of their modest server.

*misconfigured* IPv6 address on this host

Assisted them to fix the subnet mask. Not using SLAC for that host is a good idea, as then they can swap faulty hardware without additional outage from waiting for DNS TTLs to expire.

This is why people can't adopt IPv6.

Misconfigurations aren't one of the major reasons for slow adoption. The lack of IPv6 technical knowledge is one of the lesser reasons, and it's probably this which was a root cause of the misconfiguration.

rarely responds with an ICMP "Address unreachable".

That is to misdiagnose the behaviour. If the host was misconfigured then the host couldn't send a ICMP which could reach you. Rather that ICMP came from the subnet's router. Routers rate limit ICMP generation to limit denial of service attacks against their control plane. This is only apparent to diagnostic programs, as other programs will heed the initial ICMP rather than keep pounding away (and if the program never received that ICMP then it is unlikely to receive a second ICMP the router may send).

linux.conf.au 2013 videos online

Posted Feb 21, 2013 18:08 UTC (Thu) by ARealLWN (guest, #88901) [Link]

I'm no expert but that sounds like a bufferbloat problem to me. I would like to comment further but don't feel I've read enough to know too much. I wish lwn.net had covered this better or that there was a video posted somewhere I could watch, possibly in .ogv or .mp4 format.


Copyright © 2017, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds