RE: TCP Acceleration

Yes video is encoded, but the throughput between encoder (located in country
A) and streaming server (located in country B) and these two location are
connected through internet bandwidth.

problem with the tcp is:
- tcp is inherently slower than streaming
- throughput affected by tcp window size
- internet makes it worse - delays in ACKs
- pre-session utilization limited
- tcp slow-start and short sessions
- congestion avoidance methods can hurt

if we look on TCP ACKs
1. [client] <------- [server]B B server sends some packets to client
2. [4 packets sent to client] once a pre-determined number is sent, server
stops sending - waits for ACKs of receipt
3. [client] ---------> [server]B client acknowledges the 4 packets from the
server. once receved server can send again. [1 packet sent to server]
B
so potentially a tcp accelerator can have BIG windows and multiple streams.

like I have one site A its windows size is 256kB and there are 2 streams so
total throughput is 9.45Mbits/s

and site B windows size is 64kB and 8 streams total throughput is 26.8Mbits/s

If anyone can more elaborate it, will be more helpful and understandable.

HTH

--- On Sat, 6/13/09, Abdul Waheed Ghaffar <a_w_ghaffar_at_hotmail.com> wrote:

From: Abdul Waheed Ghaffar <a_w_ghaffar_at_hotmail.com>
Subject: RE: TCP Acceleration
To: muhammad.nasim_at_gmail.com, ccie_at_starasiatv.com
Cc: tfaria72_at_gmail.com, ccielab_at_groupstudy.com
Date: Saturday, June 13, 2009, 11:21 AM

#yiv792536525 .hmmessage P
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B

Video is usuallyB encoded/compressed regardless of Streaming (content sent in
compressed form over the Internet and displayed by the viewer in real
time)B OR in any other format.B So these devices will not really add any
value,...just a thought.

B

Thanks

Abdul Waheed
B
> From: muhammad.nasim_at_gmail.com
> Date: Sat, 13 Jun 2009 09:02:37 +0300
> Subject: Re: TCP Acceleration
> To: ccie_at_starasiatv.com
> CC: tfaria72_at_gmail.com; ccielab_at_groupstudy.com
>
> No issues I can mention
> 1) Riverbed (on top )
> 2) Juniper (2nd Choice but mostly become first choice as Juniper has
> presence in countries better then RIVERBED)
> 3) Cisco (Cisco is catching up quite aggressively after the newer version
of
> WAAS , software version I mean)
>
> The above is my selected vendors. There are also other
>
> 1) Packeeter (now own by Bluecoat)
>
> Also check the Gartner Magic Qudrant you can get other venbors as well but
> above all are what mostly customers are using
>
>
> BTW you are from which part of the world and how many branches you have on
> the WAN you can get the demostration boxes from the vendor based on the
size
> of your network and also the seriousness of buying solution
>
> HTH
>
>
> HTH
>
>
> 2009/6/13 Muhammad Anjum <ccie_at_starasiatv.com>
>
> > Please mention some vendor names. And if u don't want to mention names on
> > this list plz send me private msg.
> >
> > Thanks,
> > Nadeem
> >
> >
> > --- On *Sat, 6/13/09, Muhammad Nasim <muhammad.nasim_at_gmail.com>* wrote:
> >
> >
> > From: Muhammad Nasim <muhammad.nasim_at_gmail.com>
> > Subject: Re: TCP Acceleration
> > To: "Anthony Faria" <tfaria72_at_gmail.com>
> > Cc: "Muhammad Anjum" <ccie_at_starasiatv.com>, ccielab_at_groupstudy.com
> > Date: Saturday, June 13, 2009, 10:42 AM
> >
> >
> > Yup checkout the WAAS Appliance from Cisco, BTW there are other vendors
> > also around which you can check : )
> >
> > HTH
> >
> >
> > 2009/6/13 Anthony Faria
<tfaria72@gmail.com<http://mc/compose?to=tfaria72@gmail.com>
> > >
> >
> >> You can check out the waas.
> >>
> >> Tony
> >>
> >>
> >> On Fri, Jun 12, 2009 at 10:22 PM, Muhammad Anjum
<ccie@starasiatv.com<http://mc/compose?to=ccie@starasiatv.com>
> >> > wrote:
> >>
> >>> Hi,
> >>>
> >>> I am looking for a WAN accelerator (1st option u mentioned).
> >>>
> >>> Thanks,
> >>> Nadeem
> >>>
> >>>
> >>> --- On Sat, 6/13/09, Muhammad Nasim
<muhammad.nasim@gmail.com<http://mc/compose?to=muhammad.nasim@gmail.com>>
> >>> wrote:
> >>>
> >>> From: Muhammad Nasim
<muhammad.nasim@gmail.com<http://mc/compose?to=muhammad.nasim@gmail.com>
> >>> >
> >>> Subject: Re: TCP Acceleration
> >>> To: "Muhammad Anjum"
<ccie@starasiatv.com<http://mc/compose?to=ccie@starasiatv.com>
> >>> >
> >>> Cc: ccielab_at_groupstudy.com
<http://mc/compose?to=ccielab@groupstudy.com>
> >>> Date: Saturday, June 13, 2009, 9:26 AM
> >>>
> >>> Hi Nadeem,
> >>> What exactly you are looking for ?
> >>> Are you looking for
> >>> 1) WAN Acceleration (tcp and other types of acceleration included)
Cisco
> >>> has
> >>> solution
> >>>
> >>> 2) looking to enhance the video streaming or TCP which is published
> >>> on the website and internet users want to access it (Cisco has solution
> >>> for
> >>> that as well)
> >>> Give more inputs may be I can help
> >>> Thank
> >>>
> >>> 2009/6/13 Muhammad Anjum
<ccie@starasiatv.com<http://mc/compose?to=ccie@starasiatv.com>
> >>> >
> >>>
> >>>
> >>> Hi all,
> >>>
> >>>
> >>> Is there any cisco solution for TCP acceleration for higher
throughput's
> >>> (for
> >>> video streaming). like im using skyx, but it support 10mbps only.
> >>>
> >>> Provide me any any suggestion.
> >>>
> >>>
> >>> Thanks,
> >>>
> >>> Nadeem
> >>>
> >>>
> >>>
> >>> Blogs and organic groups at http://www.ccie.net
> >>>
> >>>
> >>> _______________________________________________________________________
> >>>
> >>> Subscription information may be found at:
> >>>
> >>> http://www.groupstudy.com/list/CCIELab.html
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> Muhammad Nasim
> >>> Network Engineer
> >>> Saudi Arabia
> >>>
> >>>
> >>> Blogs and organic groups at http://www.ccie.net
> >>>
> >>> _______________________________________________________________________
> >>> Subscription information may be found at:
> >>> http://www.groupstudy.com/list/CCIELab.html
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >
> >
> > --
> > Muhammad Nasim
> > Network Engineer
> > Saudi Arabia
> >
> >
>
>
> --
> Muhammad Nasim
> Network Engineer
> Saudi Arabia
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>

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Received on Fri Jun 12 2009 - 23:49:52 ART