🚀 go-pugleaf

[POSTED TO comp.dcom.modems.cable; PLEASE REPLY THERE]

Unfortunately, since SACK and RWIN are global in Windows, and can't be
changed without rebooting, it only takes a sizeable fraction of
non-support to undermine the rationale for large RWIN based on SACK.


In <3A457F17.1AA91CC9@mynetwatchman.com>, Lawrence Baldwin
<baldwinlSPAMMENOT@mynetwatchman.com> wrote:

>OK...I pulled packet traces from the top five sites.  The results were
>more
>difficult to analyze than I expected:
>
>
>I'll post details later, but here's some observations:
>
>* Only 3/5 main sites (holding homepage) supported SACK
>(basically irrelevant since homepage itself is not intensive)
>
>* All secondary "image" servers (which home page references) 
>had SACK enabled
>
>* Here's an interesting one: NONE of the ad servers referenced
>by home page supported SACK...damn ads!
>
>* My mail server (tzo.com) doesn't support SACK
>
>John Navas wrote:
>> 
>> [POSTED TO comp.dcom.modems.cable; PLEASE REPLY THERE]
>> 
>> http://www.mediametrix.com/data/thetop.jsp
>> 
>> In <3A44E4F4.6E7B3C4C@mynetwatchman.com>, Lawrence Baldwin
>> <baldwinl@mynetwatchman.com> wrote:
>> 
>> >Someone propose 5 top download sites (e.g. download.com) and I'll
>> >check them with my Sniffer to see if SACKs are enabled on the server
>> >side.
>> 
>> >John Navas wrote:
>> 
>> >> The problems are that (1) SACK is negotiated with each connection
>> >> [remote host] and (2) not all remote hosts support SACK.  Thus it may
>> >> not be used even if the user has it enabled.

-- 
Best regards,
John Navas     <http://navasgrp.home.att.net/>
     CABLE MODEM/DSL GUIDE:  <http://Cable-DSL.home.att.net/>