Posted 03/23/09 at 08:05:51 PM by Pulkit Chandna

Some users of Netflix’s streaming service have groused about dwindling performance in recent times. The dip in performance has not only nettled users but also engendered speculation as to its cause. The most plausible conjecture is that video streams are being deliberately throttled by Netflix.

But Netflix’s chief product officer Neil Hunt has dismissed such misgivings and passed the buck to the ISPs. He even claimed, on the company’s official blog, Netflix can’t resort to throttling even if it wants to because it relies on third-party Content Delivery Network (CDN) services.

“Also, routing to different ISPs in the same region may be quite different, thus performance may also be quite different, even for neighbors, if they are connected to different ISPs. Moreover, congesting points can rise and fall with ISP configuration changes and other conditions,” Hunt wrote.

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Posted 01/06/09 at 09:44:17 AM by Paul Lilly

All systems are go for Comcast, who confirmed to DSL Reports it has implemented its broadband throttling system across all markets. The two-condition throttling system works by first examining aggregate traffic usage data for individual segments of Comcast's high-speed internet (HSI) network. If the overall upstream or downstream usage reaches a predetermined level, the software system then identifies which subscribers are using a disproportionate share of the bandwidth and assigns them a lower priority status. According to Comcast, throttling won't actually occur "so long as the network segment is not actually congested" (see Comcast's filings with the FCC in PDF form).

It will take a sustained use of 70 percent of the downstream throughput for a user to be assigned a lower priority, which will remain that way until usage drops to 50 percent of the provisioned upstream or downstream bandwidth for about 15 minutes. In this throttled state, traffic may or may not be delayed or dropped, depending on the overall demand, Comcast says.

In the past, Comcast received heavy criticism over its decision to use forged TCP packets to throttle upstream P2P services no matter how much bandwidth a user was consuming. This new system of identifying and potentially thwarting bandwidth hogs sounds a fair bit, well, more fair than the ISP's previous approach, but we'd like to hear your thoughts on the matter.

Do you like what Comcast is doing? Hit the jump and sound off.

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Posted 05/07/08 at 10:17:32 PM by <a href="/david_murphy">David Murphy<br /></a>

Comcast's proposed Internet cap of 250GB per month runs contrary to its pay-for-performance speed enhancements. And if you think that's shocking, just wait until you see the overage fees!

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