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For 11.5 htsplit mode is enabled by default. htsplit is actuals only for platform/blades which have CPU with hyper-threading. htsplit mode decrease number of tmms in twice. So after upgrade from 11.4 to 11.5, you may see that DOS attacks happens on normal traffic rates. Example: You have BIG-IP 10000/12000 with 11.4 with 12 tmms, and you configure DOS accordingly. Then when you make upgrade to 11.5 and you end up with 6 tmms because of htsplit mode.
You may see false-alarm DOS attack on normal traffic rates.
Platform/blade CPU have hyper-threading and sys db scheduler.splitplanes.ltm = "true"
Double the thresholds for AFM DOS vectors.
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