My download speed was as sharp as the upload speed and now its not

[muramune]

1 hour ago, Lurick said:

No, it's not the issue and QoS limits your overall bandwidth for a queue not the ramp speed unless you're on enterprise gear with bursting and even then it's bursting over the limit set not the initial speed.

so what influences the ramp speed?

[Alex Atkin UK]

1 minute ago, muramune said:

so what influences the ramp speed?

If you're just concerned about streaming and game jitter its unlikely to be the problem anyway, your speeds are an order of magnitude greater than needed for that.

 

But if you really want to know, all broadband is on a shared basis.  If other people sharing the same link as yourself to the ISP are also heavily downloading/uploading, then everyones speeds will be lower.

Exactly how big a pipe you are sharing and with how many other people varies considerably by telco, ISP and technology in use.

[muramune]

2 minutes ago, Alex Atkin UK said:

If you're just concerned about streaming and game jitter its unlikely to be the problem anyway, your speeds are an order of magnitude greater than needed for that.

 

But if you really want to know, all broadband is on a shared basis.  If other people sharing the same link as yourself to the ISP are also heavily downloading/uploading, then everyones speeds will be lower.

Exactly how big a pipe you are sharing and with how many other people varies considerably by telco, ISP and technology in use.

you mean if we are all playing the same game?

 

or you mean the wires on themselves? cus i have FTTH (sorry if im being extra ignorant xd)

[Alex Atkin UK]

2 hours ago, muramune said:

you mean if we are all playing the same game?

 

or you mean the wires on themselves? cus i have FTTH (sorry if im being extra ignorant xd)

The connection from your home to the other end is usually shared with other customers.   Example, if its GPON based then you are sharing 2.4Gbit down, 1.2Gbit up with potentially 32-64 other people who are connected to the same fibre.  What you pay for is how much of that capacity you have access to.  Usually you will be able to hit (as not everyone will be using it that much) your cap, but at peak hours the odds of the connection reaching capacity is increased.

 

Even if its dedicated fibre for you alone, somewhere up from that it will be shared over something like a 10Gbit fibre link which is ALWAYS smaller than the combined speed of everyone connecting to it.  Its simply not feasible to have enough bandwidth for everyone to be maxed out when the law of averages means 99% of the time very little of that bandwidth would be in use.

The entire Internet works this way but the amount of bandwidth goes up exponentially the further up the chain so contention gets less and less likely.

[muramune]

1 hour ago, Alex Atkin UK said:

The connection from your home to the other end is usually shared with other customers.   Example, if its GPON based then you are sharing 2.4Gbit down, 1.2Gbit up with potentially 32-64 other people who are connected to the same fibre.  What you pay for is how much of that capacity you have access to.  Usually you will be able to hit (as not everyone will be using it that much) your cap, but at peak hours the odds of the connection reaching capacity is increased.

 

Even if its dedicated fibre for you alone, somewhere up from that it will be shared over something like a 10Gbit fibre link which is ALWAYS smaller than the combined speed of everyone connecting to it.  Its simply not feasible to have enough bandwidth for everyone to be maxed out when the law of averages means 99% of the time very little of that bandwidth would be in use.

The entire Internet works this way but the amount of bandwidth goes up exponentially the further up the chain so contention gets less and less likely.

great explanation but "up the chain"? and "contention"? can you elaborate?

[Alex Atkin UK]

16 hours ago, muramune said:

great explanation but "up the chain"? and "contention"? can you elaborate?

Contention is when you have say four customers on Gigabit all trying to pull full speed from that 2.4Gbit shared connection, we'd call that a 2:1 contention ratio as there is only half the bandwidth available than would be needed to avoid a bottleneck if everyone is downloading as fast as they can.  The actual contention ratio is likely a lot higher but they're not going to tell you what it is and a good telco/ISP should monitor it to ensure most of the time its never maxed out.

By further up the chain I merely meant where the various different parts of the network connect to each other.  In the above example, your 2.4Gbit PON might connect to your ISP over a 10Gbit fibre link shared with (just an example) 10 other 2.4Gbit PONs.  So you can be bottlenecked at various points, but as its unlikely every customer HAS Gigabit or that many customers will actually be pushing full speed at the same time, you'll generally not see it.

 

I've seen some articles claim contention is not an issue on fibre, but this is not true at all.  Some ISPs will sell 10Gbit fibre over a 10Gbit PON, so one single user could (in theory but unlikely) max it out.  Its all based on calculations by the ISP of what the "average" use will be so that the majority of the time every user will achieve full speed.

A dedicated 10Gbit link to your ISP is insanely expensive, this is the kind of thing data centres or big businesses would use if they need guaranteed capacity.  You have to remember the speed OUT of your ISP will be far less than every customer combined could use, so with a dedicated line you're paying a premium for them to ensure those links are big enough to guarantee your speed also.