Re: [LARTC] urgent question about tcng!

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Thomas Mandl wrote:
> Hello List,
> I'm new to QoS/tcng/HTB and friends, so please forgive me if my question
> might be silly...
> After having read lots of HowTo documents I'm totally confused...
> 
> The Challenge:
> =======
> I'll have to deploy several "mirror" download servers (Linux) which must be
> able to handle a huge number of HTTP download requests (about 10k to 20k
> unicast requests per server within 120 min.) which will hit my servers . The
> mirror servers will be connected with 100MBit to the Internet backbone. Each
> "client" will download between 7MB up to 30MB per request. The download
> mirror servers will be directly attached to the Internet (no FW or router
> between, which could handle QoS for me). Of course will these download
> mirrors be specially hardened :-)
> 
> The Idea:
> ====> I can not handle all the traffic at once without QoS, so I thought it should
> be possible to establish a traffic control mechanism to guarantee bandwith
> for each client download (e.g. 256kbps CIR up to 512kbps ceil). This should
> allow me, to "serve" all clients within 120 min, before a new download wave
> will hit my servers. If the available bandwith for HTTP traffic is used,
> clients shall not be able to start a download, until some bandwith is freed
> by another client who finished a download. 
> 
> Note: I would rather go with "tcng" than with the old "tc".
> 
> The Problem:
> ======
> While playing with tcng and HTB I managed to shape traffic (to limit the
> total bandwith for HTTP traffic to e.g. 50Mbps) but I did not manage to
> write a tcng configuration which guarantees a certain bandwith per client
> request. I must be able to assign (and guarantee) a defined bandwith to a
> client request, to make the downloads more predictable. My experiments so
> far only allowed me to limit e.g. HTTP traffic, which then was equally
> distributed to the number of clients, but this led to the usual "traffic
> jam" when too many clients initiated a simultanes download.
> 
> Can anybody please assist me, or does anybody have a working "tcng" config
> file to do the job. Additional readings/comments/links (beside those listed
> in the LDB/Linux Traffic Control Howtos are also welcome.)

Wang Jian posted a perflow queue recently -

http://mailman.ds9a.nl/pipermail/lartc/2005q2/015381.html

It is the sort of thing you need if you can't do it with apache as 
recommended.

Andy.

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