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From Sudheer Vinukonda <sudhe...@yahoo-inc.com>
Subject Re: High Upstream Utilization Background Fetch Plugin behavior
Date Wed, 16 Mar 2016 20:28:44 GMT
Is there a typo in the below line? 
exclude Content -Length < 1000
 
If there is, pls try changing it as below:

exclude Content-Length <1000

Once you change the config, you may want to functionally validate by sending a range request
for a large ( > 1000 bytes) objects to see if it behaves correctly.

"- Set Max object size to 100 or 200 MB"

max object size only affects the size of the objects stored in the Cache. It does not prevent
the downloading of larger objects from your upstream, so, it will not help with saving upstream
bandwidth. In fact, if any, it may make it worse, since ATS will basically download the large
objects for every request (however, long tail they may be).
Thanks,
Sudheer

    On Wednesday, March 16, 2016 12:15 PM, Muhammad Faisal <faisalusuf@yahoo.com> wrote:
 

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.yiv6432582609plain TT {FONT-SIZE:12pt;FONT-FAMILY:Calibri;}#yiv6432582609 BODY {FONT-SIZE:12pt;FONT-FAMILY:Calibri;}Hi,After
more than two months of testing and great support from entire ATS team, finally we have integrated
ATS in production scenario as transparent caching . Currently we have put limited traffic
to it approx 200mbps (1k plus users). After putting actual load on the server i'm observing
the upstream utilization has been increased. Last stats that i have viewed are 130Mbps (upstream)
and 41.6Mbps (to clients) so there is negative impact of caching instead.  It is worth mentioning
that I have used background fetch plugin to cache range requests (to improve cache performance
specially streaming). The max object size currently is set to zero. During testing I have
observed when downloading a large file the ATS were starting object download on available
upstream capacity. The large file like ISO of 600 MB takes lots of bandwidth to fill the object
while delivering to the user according to allocated speed on next object hit however the object
was delivered from the cache. I production scenario the above behavior is causing increased
upstream utilization while the hit probability on larger objects are rare. I need experts
opinion to improve traffic saving. What comes to my mind is: - Set Max object size to 100
or 200 MB- Keep using background_fill plugin and exclude the larger objects (max object size)-
How to exclude larger files to being background fill above e.g 200Mbps Below are my background
fill configs: exclude Content -Length < 1000  (this is to exclude small object less than
1000 bytes?)
include Content-Type video/mp4
exclude Content-Type text
include Content-Type video/quicktime
include Content-Type video/3gpp
include Content-Type application/octet-stream
  --Regards,Faisal. 

  
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