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

[Rodney Dunn]

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
> 
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