3 ms·
Why would a single big download fill the buffers? Router → LAN is typically an order of magnitude more bandwidth than internet → router, so shouldn't the buffer
by floatboth 9y ago
Why would a single big download fill the buffers? Router → LAN is typically an order of magnitude more bandwidth than internet → router, so shouldn't the buffer be emptied faster than filled?
- supertrope 9y agoThe bottleneck is at your ISP's CMTS or DSLAM and your modem. e.g. The DSLAM has 1 Gbps in and only 40 Mbps down the line to your VDSL modem. Or your cable modem has access to 600 Mbps of capacity but your plan is only 100 Mbps so the modem limits. So there's quick stepdown: 1 Gbps, 600 Mbps, 100 Mbps.
- floatboth 9y agoYeah, the stepdown is on the ISP side, how would it affect buffers of my consumer router?
- supertrope 9y agoFor downloads it's buffers in your ISP's hardware that matter. For uploads it's your router's egress buffer. e.g. You are syncing gigabytes to Dropbox. A poorly designed router will continue to accept packets far past upstream capacity. Now that's there's 2000 ms of bulk traffic in the router's queue, any real time traffic has to wait a minimum of 2 seconds before getting out.
- floatboth 9y agoYeah, exactly. I mean, in your original comment you talked about bufferbloat on crappy consumer hardware and the example was a big download :)