Alastair Johnson wrote:
Perry Lorier wrote:
Think it's only a few guys that are cool enough to have big enough networks to see bandwidth delay issues on Long Fast Networks?
Next time you're on a XP machine on DSL, goto http://nzadsl.co.nz/speedtest/ and check what speed you're getting. You'll probably get no more than about 4.5mbit/s using a SINGLE tcp stream. (Multiple TCP streams will of course get more bandwidth)
This is because XP has a RWin of about 17,520ish bytes. Latency over the DSL network to the speed test is about 30ms:
[snip]
But Wait! It gets WORSE. It's 170ms RTT to the US from here. So:
140160 bits / .17s = 824,470 bits/s == 824.5kbit/s.
[snip lots more clever maths]
So: All service providers should be looking at deploying ALGs/proxies running on hosts with much better TCP configuration, to avoid the long haul latency impact?
Putting a web proxy in New Zealand that parents of a web proxy in the US and putting a wpad.<domainname> server in your network pointing at them would probably produce a pretty significant performance boost for people doing HTTP without the nastiness of transparent proxies or other middleboxes causing issues. WAND did on this in late 90's about how to use whatever bandwidth NZ had IIRC before the southern cross cable was finished: https://secure.wand.net.nz/pubDetail.php?id=23 https://secure.wand.net.nz/pubDetail.php?id=13 https://secure.wand.net.nz/pubDetail.php?id=24 https://secure.wand.net.nz/pubDetail.php?id=25