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

[Hank Nussbacher]

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