[c-nsp] 12.4(11)T QoS problems (again)

Rodney Dunn rodunn at cisco.com
Mon Jul 30 11:15:52 EDT 2007


On Sat, Jul 28, 2007 at 07:18:24AM +0300, Rafi Sadowsky wrote:
> Hi Rodney,
> 
>  FYI: The router is a 7206VXR NPE-G1 with most of traffic between 2 of the 
> NPE GbE interfaces

Ok. Good because the CPU change if there is one significant would
show up between the two versions.

> 
> Any particular reason you mentioned a NPE-G2 ?

Search the archives for the NPE-G2 measurement discussions
we've had.

Rodney

> 
> 
> -- 
> Regards
> 	Rafi
> 
> [sh ver]
> Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 
> 12.4(4)T1, RELEASE SOFTWARE (fc4)
> Technical Support: http://www.cisco.com/techsupport
> Copyright (c) 1986-2005 by Cisco Systems, Inc.
> Compiled Wed 21-Dec-05 22:58 by ccai
> 
> ROM: System Bootstrap, Version 12.3(4r)T3, RELEASE SOFTWARE (fc1)
> BOOTLDR: 7200 Software (C7200-KBOOT-M), Version 12.3(15), RELEASE SOFTWARE 
> (fc3)
> 
> Tel-Aviv uptime is 1 week, 5 days, 1 minute
> System returned to ROM by reload at 07:07:17 IDT Mon Jul 16 2007
> System restarted at 07:09:50 IDT Mon Jul 16 2007
> System image file is "disk2:c7200-advipservicesk9-mz.124-4.T1.bin"
> Last reload reason: Reload Command
> 
> Cisco 7206VXR (NPE-G1) processor (revision B) with 491520K/32768K bytes of 
> memory.
> Processor board ID 26812591
> SB-1 CPU at 700MHz, Implementation 1025, Rev 0.2, 512KB L2 Cache
> 6 slot VXR midplane, Version 2.6
> 
> Last reset from power-on
> 
> [snipped]
> 
> PCI bus mb1 (Slots 1, 3 and 5) has a capacity of 600 bandwidth points.
> [snipped]
> PCI bus mb2 (Slots 2, 4 and 6) has a capacity of 600 bandwidth points.
> [snipped]
> 
> 
> 4 Ethernet interfaces
> 2 FastEthernet interfaces
> 3 Gigabit Ethernet interfaces
> 8 Serial interfaces
> 1 Packet over SONET interface
> 509K bytes of NVRAM.
> 
> 125952K bytes of ATA PCMCIA card at slot 2 (Sector size 512 bytes).
> 16384K bytes of Flash internal SIMM (Sector size 256K).
> Configuration register is 0x2102
> 
> -- 
> Regards,
> 	Rafi
> 
> On Fri, 27 Jul 2007, Rodney Dunn wrote:
> 
> >Date: Fri, 27 Jul 2007 08:52:26 -0400
> >From: Rodney Dunn <rodunn at cisco.com>
> >To: Hank Nussbacher <hank at efes.iucc.ac.il>
> >Cc: cisco-nsp at puck.nether.net, nocplus at noc.ilan.net.il
> >Subject: Re: [c-nsp] 12.4(11)T QoS problems (again)
> >
> >I'd be interested to know this as well. I helped draft the FN on this
> >one to make sure they were clear.
> >
> >In the fixes that went in 15T1 there was really only one, rather large,
> >change to improve the dataplane performance. Others were mostly bug
> >functionality problems.
> >
> >The NPE-G2 performance comparisons are harder given our previous
> >discussions around how it does CPU measurements.
> >
> >Rodney
> >
> >
> >On Fri, Jul 27, 2007 at 07:10:06AM +0300, Hank Nussbacher wrote:
> >>Cisco Field Notice: Field Notice: FN - 62854 - Cisco IOS - Performance
> >>Degradation and Reloads Possible When Using Quality of Service Features in
> >>Version 12.4(11)T - July 26, 2007
> >>
> >>http://www.cisco.com/en/US/customer/products/ps6441/products_field_notice09186a008088cc2f.shtml
> >>
> >>"Workaround/Solution
> >>There is no workaround that avoids all possible symptoms. A complete
> >>solution is expected to be available in Cisco IOS version 12.4(15)T1. To
> >>avoid the symptoms, users may downgrade to a pre-12.4(11)T release or
> >>upgrade to 12.4(15)T1 when it becomes available. Cisco strongly
> >>discourages deploying an IOS 12.4(11)T release with QoS features enabled
> >>due to the potential severity of symptoms."
> >>
> >>We went to 12.4(15)T around the beginning of July (it is now a Deferred
> >>Release) and it did *not* help so we went back to 12.4(4)T1 which does fix
> >>the performance problems.  One can see the exact change dates via this
> >>MRTG CPU graph: http://noc.ilan.net.il/stats/ILAN-CPU/tau-7206-cpu.html
> >>
> >>I see 12.4(15)T1 came out July 20.  Has anyone tested it (non-Cisco) and
> >>found that it does solve all performance problems?
> >>
> >>-Hank
> >>
> >>_______________________________________________
> >>cisco-nsp mailing list  cisco-nsp at puck.nether.net
> >>https://puck.nether.net/mailman/listinfo/cisco-nsp
> >>archive at http://puck.nether.net/pipermail/cisco-nsp/
> >


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