<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thanks a lot, Diego!<br><br>I still have several question though. Assume that we don't have a port scheduler defined, and we do get congestion. As you mentioned, now queues are transmitted at the physical level using round robin, with expedited queues being served first.<br><br>1. By "queues" do you mean the queue-to-be-transmitted for each SAP? If there are multiple tier 1 schedulers, or orphaned queues in a SAP, which one will get transmitted? (or will these queues now become the candidates for the physical level round-robin?)<br><br>2. How are the weights assigned for all these queues? Or is this just an plain old round-robin with every queue equally weighted?<br><br>3. If under each SAP I have hierarchical scheduler, it is possible that for one SAP, the next packet to be sent comes from an best-effort queue but the next-next one comes from an expedited
queue (although this is a bad design). In this case, will this SAP have to wait in the physical level until the expedite queues from other SAPs are transmitted?<br><br>I hope I state the problems clearly. Thanks again for all who kindly answer!<br><br>Best Regards,<br>Kila Hsu<br><br>--- On <b>Mon, 2/16/09, GARCIA DEL RIO Diego <i><Diego.Garcia_Del_Rio@alcatel-lucent.be></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">From: GARCIA DEL RIO Diego <Diego.Garcia_Del_Rio@alcatel-lucent.be><br>Subject: Re: [alcatel-nsp] Question about Service QoS Policies on 7750SR<br>To: alcatel-nsp@puck.nether.net<br>Date: Monday, February 16, 2009, 1:15 PM<br><br><div id="yiv1249666742">
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<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Hi Hsu,</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; 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.</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; 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.</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; 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.</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">
So.. in short, if using TiMOS 5.0 or newer, take a look at port-level
schedulers ;-)</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Cheers!</span></font></p>
<p class="MsoNormal"><font color="navy" size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; 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></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">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</span></font></p>
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