iRule development: subtable spreading among TMMs
Hi, I'm trying to understand the best way to design an iRule that will need to handle a lot of table entries and do that fast, as we're talking about rate limit on client connections. I've found a very useful example of an iRule that create some subtables so they're spreaded among the TMMs, but I don't fully understand how it works. In the documentation about the "table" command I read "All of the entries in a given subtable are on the same processor. So if you put all of your entries (or the vast majority of them) into the same subtable, then one CPU will take a disproportionate amount of memory and load." So if I understand it right, each subtable will be pinned to a processor, so creating several subtables I'd be able to spread it among the processors and the iRule will handle the data on the subtables more efficiently, right? I'm working on a Viprion with 2 B2150. Each blade has a Intel Quad Core processor, that gives me just a tmm process that creates 4 threads, one for each core. The Hyperthreading in the processor gives me 8 virtual processing cores, but from the point of view of the TMM the system has 4 cores per blade, right? In summary, the TMM::cmp_count variable gives me a value of 8, I guess that this 8 are the 8 physical cores that I got with those 2 quad core processors, right? I think that I'd have to create at least 8 subtables to get advantage of the data spreading among cores, wight? (1 subtable per core) so... what's the real meaning of that ~3+ factor??? does it mean that I'm creating 3 subtables per core? why a value of 3 and not, for example, 2 or 4? I guess that maybe that 3 factor depends on how much data you have to handle, maybe "1 * TMM::cmp_count" is enough if my subtable doesn't grow to much, maybe if I want smaller subtables I have to use "2 * TMM::cmp_count", "3 * TMM::cmp_count" or even "4 * TMM::cmp_count" right? Someone can explain me the meaning of that 3 factor???? Thanks! :)
Conver Data Group List to static variables
I am looking to convert the global variables listed in Data Group List to a list of static variables. I am doing this as the virtual server associated with a few iRules are accessing them that would demote CMP. I am planning to create an iRule having only RULE_INIT that would set the static variables. Is there a good migration plan or if there is a better way to do this, can anyone suggest? Thanks!
Query on HTSplit and CMP
Hello Folks, I am trying to understand threading and HTSplit feature on BIG-IP. As per https://support.f5.com/csp/article/K14358, lets consider the example of BIG-IP 3900 and 4000. 3900 - 1 Quad Core 4000- 1 Quad Core (+HT) If my understanding is correct, each physical CPU on a BIG-IP device corresponds to a relevant TMM process. So considering above example, Number of TMM process on either device = 1 Now 1 CPU considering 4 cores will have equivalent 4 threads of TMM. Now the point which i am not able to relate to is: TMM threads (>=11.3.0, or >=11.5.0 with HTSplit disabled): 39001 Quad-core1 TMM threads : 4 4000/4200 1 Quad-core (+HT)1 TMM threads : 8 TMM threads(>=11.5.0 with HTSplit enabled, default) 39001 Quad-core1 TMM threads : 4 4000/4200 1 Quad-core (+HT)1 TMM threads : 4 Why is TMM thread =4 with HTsplit enabled on 4000 ?