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This collection of QOS domains is >> +referred to as GMBA control domain. The GMBA control domain is created by >> +setting the same GMBA limits in one or more QoS domains. Setting the default >> +max_bandwidth excludes the QoS domain from being part of GMBA control domain. > I don't see any checks that the user sets the *SAME* GMBA limits. > > What happens if the user ignores the dosumentation and sets different > limits? Good point. Adding checks could be challenging when users update each schema individually with different values. We don't know which one value is the one he is intending to keep. > ... snip ... > > + # cat schemata > + GMB:0=2048;1=2048;2=2048;3=2048 > + MB:0=4096;1=4096;2=4096;3=4096 > + L3:0=ffff;1=ffff;2=ffff;3=ffff > + > + # echo "GMB:0=8;2=8" > schemata > + # cat schemata > + GMB:0= 8;1=2048;2= 8;3=2048 > + MB:0=4096;1=4096;2=4096;3=4096 > + L3:0=ffff;1=ffff;2=ffff;3=ffff > > Can the user go on to set: > > # echo "GMB:1=10;3=10" > schemata > > and have domains 0 & 2 with a combined 8GB limit, > while domains 1 & 3 run with a combined 10GB limit? > Or is there a single "GMBA domain"? In that case, it  is still treated as a single GMBA domain, but the behavior becomes unpredictable. The hardware expert mentioned that it will default to the lowest value among all inputs in this case, 8GB. > Will using "2048" as the "this domain isn't limited > by GMBA" value come back to haunt you when some > system has much more than 2TB bandwidth to divide up? It is actually 4096 (4TB). I made a mistake in the example.  I am assuming it may not an issue in the current generation. It is expected to go up in next generation. GMB:0=4096;1=4096;2=4096;3=4096;    MB:0=8192;1=8192;2=8192;3=8192;     L3:0=ffff;1=ffff;2=ffff;3=ffff > > Should resctrl have a non-numeric "unlimited" value > in the schemata file for this? The value 4096 corresponds to 12th bit set.  It is called U-bit. If the U bit is set then that domain is not part of the GMBA domain. I was thinking of displaying the "U" in those cases.  It may be good idea to do something like this. GMB:0=      8;1=      U;2=     8 ;3=      U;    MB:0=8192;1=8192;2=8192;3=8192;     L3:0=ffff;1=ffff;2=ffff;3=ffff > > The "mba_MBps" feature used U32_MAX as the unlimited > value. But it looks somewhat ugly in the schemata > file: Yes, I agree. Non-numeric would have been better. Thanks Babu