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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Hsu,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
If your version of TiMOS allows it, you could run a “port-parent”
scheduler, which allows you to map the parent scheduler of the queues in the
SAPs to a port-level scheduler that will distribute bandwidth between all
it’s children according to the configured prioritied.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
If you don’t have the port-schduler function (it appeared in TiMOS 5.0r4
and onwards), sap-queues and schedulers behave “as expected” when
there is no congestion at the port level, that is, all egressing traffic is
less than the port’s egress rate.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
If there is congestion though, and no port-scheduler is configured, queues are indeed
served in round-robin fashion with the “expedited” queues (in
in-profile state) being served exhaustively, then “best-effort”
(in-profile) and finally all out-of-profile queues.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>
So.. in short, if using TiMOS 5.0 or newer, take a look at port-level
schedulers ;-)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Cheers!<o:p></o:p></span></font></p>
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10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p><font size=2 color=black face="Trebuchet MS"><span style='font-size:10.0pt;
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</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>New Product
Introduction - Network Design Engineer</span></font><font color=navy><span
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</span></font><font size=2 color=black face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:black'>IP Division</span></font><font
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<p><font size=2 color=navy face="Trebuchet MS"><span style='font-size:10.0pt;
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
alcatel-nsp-bounces@puck.nether.net
[mailto:alcatel-nsp-bounces@puck.nether.net] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Kila Hsu<br>
<b><span style='font-weight:bold'>Sent:</span></b> 16 February 2009 16:46<br>
<b><span style='font-weight:bold'>To:</span></b> alcatel-nsp@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [alcatel-nsp]
Question about Service QoS Policies on 7750SR</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Hi,<br>
Thanks a lot to Mark for the information about the ways to share a port among
SAPs.<br>
However, my boss seems to like the idea that each SAP can have its own queues
and schedulers though..<br>
So say if I still need to deploy QoS on a per-SAP base, anyone know how the
packets from different SAPs defined on a common port would be scheduled, if
each has its own queue/scheduler?<br>
From the config guide I do see the "expedite" setting have
something to do with "hardware scheduler", but it is not clear if
the setting is used in cases like this.<br>
Any idea would be appreciated.<br>
<br>
thanks,<br>
Kila Hsu<o:p></o:p></span></font></p>
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