From: Andy Furniss <andy.furniss@dsl.pipex.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] strange behaviour of qos
Date: Sat, 19 Mar 2005 11:53:37 +0000 [thread overview]
Message-ID: <423C12C1.4050408@dsl.pipex.com> (raw)
In-Reply-To: <42319DC2.80500@post.pl>
Ratel wrote:
> Ed Wildgoose wrote:
>
>>
>>>
>>> any idea what might be wrong ?
>>
>>
>>
>>
>> Yep, something is queuing somewhere...
>>
>> Either your outbound setup allows too much outbound for the outbound
>> connection (and if you use ADSL remember packets use more bandwidth
>> than on ethernet). Or you aren't throttling your inbound connection
>> enough and queuing is occuring on the ISP end of your link
>>
>> Ed W
>>
> No, I really don't think so. The link itself is a 100%-CIR SDSL (for
> LANof 300+ machines). I've
> set up ceil(up and down) to ~95% of real bandwidth.
That may be OK as long as CIR is at ip level not atm/aal5 also if you
use older tc k means 1024.
In the case if ingress traffic - even if you set 95% and it really is
95% then you need to back off a bit as the traffic has already been
shaped by the link and at 95% you are only going to queue 5 packets for
every hundred that pass - which means tcp bursts can fill and maybe drop
from the buffer at the other end - hurting latency and if dropping -
your bandwidth allocation.
> It seems that classes exceed maximum rates (ceils) defined for them.
> For example : p2p class has ceil of 2.5 mbits
> When p2p traffic is not allowed to pass through bandwidth usage varies
> around 30%.
> Afrer allowing p2p to pass bandwidth usage quickly rises to nearly 100%.
> Is it possible to somehow isolate a class (as in cbq?) ?. In the
> archives I've
> found something like this (let's say): '[...] rate 2500kbit ceil
> 2500kbit'. This should
> produce something like isolated class , but for me it simply doesn't work.
> I'd be very grateful for any suggestions / ideas ...
>
> Ratel
>
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prev parent reply other threads:[~2005-03-19 11:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-11 13:31 [LARTC] strange behaviour of qos Ratel
2005-03-11 13:50 ` Ed Wildgoose
2005-03-12 16:58 ` Ratel
2005-03-19 11:53 ` Andy Furniss [this message]
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