Forgot your password?

Comment: Re:No. (Score 1) 289

by funwithBSD (#48212617) Attached to: Will Fiber-To-the-Home Create a New Digital Divide?

Scaling is application controlled. It has to be willing to use a larger window size.

SSH and FTP do not pick up and use larger windows by default. HPN-SSH specifically addresses this problem. Some implementations like Solaris can pick up larger sizes as well, but the APP has to decide to do it.

Larger TCP Window sizes are slowly creeping into applications, but by no means standard.

I have been fighting this specific issue in my job for the last 4 years, constantly seeing NFS/CIFS/FTP/SCP and lots of other applications like DBs, plus data migration tools like DoubleTake, Platespin, and TDMF trying to pull data over LFNs and using less than 10Mbits of an OC-3 to OC-48 that is no where near capacity or even totally silent.

Comment: Re:No. (Score 3, Interesting) 289

by funwithBSD (#48210247) Attached to: Will Fiber-To-the-Home Create a New Digital Divide?

Incorrect. Many older protocols don't support it. FTP, SSH based, etc. BOTH sides must agree to the larger window size. As little as .01% packet loss can reduce throughput by 50%.

I run into this all the time at work, where moving data over large pipes over long distances still limits transmission speeds. I move datacenters for IBM, so I see it a LOT.

If it were not such a problem, CISCO WAAS, Silverpeak, Riverbed and others would not make appliances to fix this exact problem. Riverbed even makes end user software that talks to concentrators at the corporate datacenter to eliminate TCP window size issues impacting application performance.

Comment: Re:No. (Score 4, Interesting) 289

by funwithBSD (#48209499) Attached to: Will Fiber-To-the-Home Create a New Digital Divide?

More on that:

Companies won't pay for infinite bandwidth, so they will throttle you eventually.

TCP_WINDOWS_SIZE will put a maximum on how much you can download based on how far away the server is. Anything more than 20 to 30ms and it won't be much faster than what we have today.

Anything that is encrypted is limited to the computational capacity of the CPU, unless you have an encryption acceleration chip. Around 25 to 35Mbps depending on the encryption method and how much load that crypt takes. More secure means more CPU, right now arc_four being the fastest, but least secure.

Comment: Re:What was automated? (Score 1) 236

by funwithBSD (#48102763) Attached to: Outsourced Tech Jobs Are Increasingly Being Automated

IBM cuts are about shifting technologies and not needing staff in those areas. Those like my self that have taken on new job roles and not let myself be stagnant are keeping ahead of the curve.

  OTOH, I do work on some of the job costing. We put modifiers in to account for the difference in productivity for each of the Geo regions. Once you do that, there is only about a 20% savings over US labor.

Used to be much higher, say 50%, but rising wages in many areas are closing the gap. The GDF initiative has kept jobs in the US as the savings from putting service centers in lower wage areas of the US (Think Dubuque Iowa) has closed that gap significantly.

Life. Don't talk to me about life. - Marvin the Paranoid Anroid