Re: [gentoo-user] I/net server throttling

[Philip Webb]

Recently, I asked on the list whether anyone had seen this phenomenon :

> What I'm refering to is getting downloaded files in slices,
> eg using Wget, a piece of the file downloads for  22 sec , then stops;
> Wget tries again & another  22 sec  piece comes down the pipe, then
> stops. This can go on for hours with a big file
> & doesn't seem related to the local time of day.
> My guess is that the server has been programmed to stop after  22 sec
> in an effort to share access among many clients,
> but it is irritating & also suggests the server needs faster hardware.
> Have others noticed this -- it seems to be a recent innovation --
> & is it a known ploy of server managers ?

> NB This is not the same as traffic jams.
> That sometimes happens here & may persist for  1 - 2 weeks ,
> but it feels just like driving on the highway when  1  lane is closed.
> That probably is some piece of the Internet or ISP under repair or test.

I now have an explicit example of a server doing this :

  503: hold> wget --no-check-certificate -c http://www.math.wisc.edu/~keisler/keislercalc-2-12.pdf
  --2012-07-01 15:07:18--  http://www.math.wisc.edu/~keisler/keislercalc-2-12.pdf
  Resolving www.math.wisc.edu... 144.92.166.196
  Connecting to www.math.wisc.edu|144.92.166.196|:80... connected.
  HTTP request sent, awaiting response... 302 Found
  Location: https://www.math.wisc.edu/formMail/throttle.php?URL=/~keisler/keislercalc-2-12.pdf [following]
  --2012-07-01 15:07:18--  https://www.math.wisc.edu/formMail/throttle.php?URL=/~keisler/keislercalc-2-12.pdf
  Connecting to www.math.wisc.edu|144.92.166.196|:443... connected.
  WARNING: The certificate of `www.math.wisc.edu' is not trusted.
  WARNING: The certificate of `www.math.wisc.edu' hasn't got a known issuer.
  HTTP request sent, awaiting response... 200 OK
  Length: 24184097 (23M) [application/pdf]
  Saving to: `keislercalc-2-12.pdf'

  6% [==========>                  ] 1,638,400   64.5K/s  eta 38m 5s

NB the word 'throttle' in the 2nd URL.  It has just completed
a 2nd slice downloading  3 %  of the file each time.
Yesterday when I tried, it refused to honor the '-c' flag,
which made downloading impossible, but today it seems to be honoring it.

BTW the Internet is ordinarily responsive at the moment here.

Has anyone else come across this ?  Any thoughts or comments ?

-- 
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