[PATCHES] Enable faster proxy response on low-latency links - Plain Text version

Alan DeKok aland at deployingradius.com
Sat May 17 02:37:38 CEST 2014

Jon Sexson wrote:
> These patches add support for several options allowing configuration
> of reduced proxy response times on low-latency links.  They are being
> submitted so that we can migrate from our current platform to

  That's always a good idea.  :)

> Due to SLAs with our Tier-1 Carriers, we require support for a higher
> precision response window and a reduced initial request transmission
> delay to be able to configure sub-second proxy response times.

  Hmm... I'm not sure what patch #4 is for.  The server doesn't have a
transmission delay.  The delay you're changing is just a timer for the
main thread to service the requests.

  If the response_window is small, then the delay should be set below
response_window, so that the proxied request will be timed out.

  Is that what the patch is doing?

> We need to override response window for some Tier-1 carrier clients so the
> proxy server fails over to next home server faster to satisfy required
> response times of their tighter SLAs.

  That makes sense.

> Sometimes a given sgsn has a very short-lived response time problem which
> doesn't deserve putting the home server into the zombie mode, so we'd like
> to configure tolerance to a certain amount of response window misses, which
> "max_response_timeouts" allows us to do.

  That makes sense, too.  I think the name is a little confusing, but
I'll look at that.

  Overall, the patches look reasonable and simple.

  Alan DeKok.

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