[87451] in North American Network Operators' Group
Re: The Qos PipeDream [Was: RE: Two Tiered Internet]
daemon@ATHENA.MIT.EDU (tony sarendal)
Sun Dec 18 15:53:45 2005
Date: Sun, 18 Dec 2005 20:53:15 +0000
From: tony sarendal <dualcyclone@gmail.com>
To: Chris Woodfield <rekoil@semihuman.com>
Cc: nanog@merit.edu
In-Reply-To: <F8524508-35CF-457F-912B-766D2B8E7B0C@semihuman.com>
Errors-To: owner-nanog@merit.edu
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On 18/12/05, Chris Woodfield <rekoil@semihuman.com> wrote:
>
>
> One thing to note here is that while VoIP flows are low volume on a
> bits-per-second basis, they push substantially more packets per
> kilobit than other traffic types - as much as 50pps per 82Kbps flow.
> And I have seen cases of older line cards approaching their pps
> limits when handling large numbers of VoIP flows even though there's
> plenty of throughput headroom. That's not something LLQ or priority
> queueing are going to be able to help you mitigate at all.
Only older line cards ?
Currently NPE-G1's are causing me more headaches in that regard.
At least up until last friday.
/Tony
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<br><br>
<div><span class=3D"gmail_quote">On 18/12/05, <b class=3D"gmail_sendername"=
>Chris Woodfield</b> <<a href=3D"mailto:rekoil@semihuman.com">rekoil@sem=
ihuman.com</a>> wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>One thing to note here is th=
at while VoIP flows are low volume on a<br>bits-per-second basis, they push=
substantially more packets per
<br>kilobit than other traffic types - as much as 50pps per 82Kbps flow.<br=
>And I have seen cases of older line cards approaching their pps<br>limits =
when handling large numbers of VoIP flows even though there's<br>plenty of =
throughput headroom. That's not something LLQ or priority
<br>queueing are going to be able to help you mitigate at all.</blockquote>
<div> </div>
<div> </div>
<div>Only older line cards ?</div>
<div>Currently NPE-G1's are causing me more headaches in that regard.<=
/div>
<div>At least up until last friday.</div>
<div> </div>
<div>/Tony</div>
<div> </div>
<div> </div><br> </div>
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