At 09:23 a.m. 29/04/2015, Barry Murphy wrote:
Obviously the cache fill that happens between
midnight and mid-day consumes some bandwidth, we
find the fill capacity (after the initial fill)
is about 1.2gbps for on average 2-4 hours per day.
We currently share our cache on Megaport IX
Auckland, in doing so we find weâre filling a
few other providers caches so they donât have
to fetch it from AU, so this may be helping some providers.
Thanks Barry - Thats REALLY useful. I'm involved
in downstream activity in 2 areas.
First - Uploading
We have a current project moving some older
videos from a server in NZ to Vimeo. Theres a
weekly 20GB limit on uploads and an ugly web
uploader (no restarts and a break means a complete re work).
Using ADSL its pretty ugly. It takes 3.5 days to
get 20-30GB up and ADSL 'breaks' make life a real
pain. So I pay a local church to use their
UFB. We find that uploading during the day
conflicts with US based uploaders, so only get
10Mbps upload. If I wait until 5pm, we get a
pretty good 100Mbps and the 20GB is up in about
an hour. The first time we did it a 2.5G file
that took 12 hours ( and failed) on ADSL went up in 4 minutes.
Looking at the graph, it seems we have a nice
window between 5pm and 8 or 9pm to do our uploads. Thats great to know.
The second issue - Live feeds.
We're doing quite a bit of live TV feeding using
the net now. We have RX points with both TVNZ and
TV3 - and also Sky Sport UK. The local TV
companies are OK - its local (bounces out of SYD)
and only SD and they don't really trust this IP stuff.
Sky UK is different. We send them HD at 4Mbps and
after some small adjustments for latency, can do
live crosses with 3 sec delay (4 sec total
allowing for return audio for the talent earpiece). NZ to UK is pretty solid.
The other night we tried UK to NZ. NZ RX was via
ADSL. We found we could only get a 1Mbps feed
going. (vs 4Mbps going the other way)
We need to do more testing as there are feed
aggregation points and they are different
depending on direction, but we have been
wondering if there was congestion along the way
causing the issue. If so we need to avoid doing crosses during the 'flix' peak.
We are also going to test where we do the feed
aggregation to see if that helps. Currently NZ to
UK has aggregation in London, while UK to NZ has
aggregation in LAX. We think its the LAX to NZ
leg that suffers. More testing required.