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Larry_124999's avatar
Larry_124999
Icon for Nimbostratus rankNimbostratus
May 13, 2013

http-compression in low performance

Hi All

 

We have a LTM web accelerator running v11.1.

 

Behind LTM it is a ASP.net application which can be accessed via internet. The total of in and out internet traffic is about 100Mb. Most of the data is in text type. However, after enable http-compression, the http-compression in dashboard shows only 20Kb traffic in average!

 

The LTM has http-compression license up to 4Gb.

 

The compression in IIS has been turned off.

 

We have tried the selective compression options either URL or content type, but the results are the same. http-compression traffic is about 20Kb in average.

 

The setting in http-compression profile is follow LTM default.

 

In HttpFox, we can see most of the responses with type of http/html (some may up to 200KB or more) are non-compressed. Even do not have Content-Encoding header in respose.

 

Does it normal? Could anyone guide me to fix this issue?

 

 

Thanks!

 

 

Larry

 

 

 

config
design

18 Replies

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  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    May 13, 2013
    Sorry but it's not, even if it was DC seems to reduce the quality and make things unreadable. Can you post the CLI output of the tmsh show ltm profiles ... command instead please?
  • Larry_124999's avatar
    Larry_124999
    Icon for Nimbostratus rankNimbostratus
    May 13, 2013

    Hi Steve

     

    I have attached the screens of profile setting.

     

    Let me know if anything else need. Or command export (but I don't know how).

     

    Thanks!

     

     

    Larry

     

     

     

     

  • Larry_124999's avatar
    Larry_124999
    Icon for Nimbostratus rankNimbostratus
    May 13, 2013

    Done! Ooohhh yes, both pre and post compression are all zero!

     

     

    Screen of command output are attached.

     

  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    May 13, 2013
    Sorry but I can't see any of your attachments. Can you just paste in the CLI command output for these two commands;

     

     

    tmsh show ltm profiles ...

     

    tmsh listltm profiles ...
  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    May 13, 2013
    Sorry but I can't see any of your attachments. Can you just paste in the CLI command output for these two commands;

     

     

    tmsh show ltm profiles ...

     

    tmsh listl tm profiles ...
  • What_Lies_Bene1's avatar
    What_Lies_Bene1
    Icon for Cirrostratus rankCirrostratus
    May 13, 2013
    Sorry but I can't see any of your attachments. Can you just paste in the CLI command output for these two commands;

     

     

    tmsh show ltm profiles ...

     

    tmsh list ltm profiles ...
  • Larry_124999's avatar
    Larry_124999
    Icon for Nimbostratus rankNimbostratus
    May 13, 2013
    Sorry for lated reply!

     

    Below is the outpu:

     

     

    admin@f5(Active)(/Common)(tmos) show ltm profile

     

     

    -------------------------------------------------------------

     

    Ltm::HTTP Compression Profile: wan-optimized-compression

     

    -------------------------------------------------------------

     

    Content Type Compression (bytes) Pre-Compress Post-Compress

     

    HTML 0 0

     

    CSS 0 0

     

    JavaScript 0 0

     

    XML 0 0

     

    SGML 0 0

     

    Plain 0 0

     

    Octet Stream 0 0

     

    Images 0 0

     

    Video Files 0 0

     

    Audio Files 0 0

     

    Other 0 0

     

    Total 0 0

     

    NULL-Compress 0 0

     

    Compression Ratio (%) 0

     

     

    admin@f5(Active)(/Common)(tmos) list ltm profile

     

    ltm profile http-compression wan-optimized-compression {

     

    allow-http-10 enabled

     

    buffer-size 131072

     

    defaults-from httpcompression

     

    gzip-memory-level 16k

     

    gzip-window-size 64k

     

    vary-header enabled

     

    }

     

    admin@f5(Active)(/Common)(tmos)