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They also typically rely >> on benchmark data to determine appropriate settings. >> >> Additionally, this approach is not consistent with our existing CBM setting >> model. > Hi Babu, > > I fully appreciate your point that system administrators are expected to > have complete knowledge of the hardware configuration. I believe my initial > motivation may have been unclear, so let me clarify the intention behind > "io_alloc_min_cbm_all". > > The intention of this new interface is not to hide lower-level details from > the administrator, but rather to simplify a specific, high-overhead > administration task and prevent human error, which I encountered during > testing of your series. > > > > By default, it is my understanding that when I/O allocation CBM is enabled, > all applicable shared L3 resources typically have their CBM bits set (e.g., > ffff). If an administrator wishes to revert to a clean baseline before > applying a subset of dedicated bits, the manual process requires them to > not only have knowledge of every single Domain ID > applicable to the shared L3 resource but manually construct a long, > error-prone input string. > > The objective of "io_alloc_min_cbm_all" is to provide a quick and accurate > medium to revert this topology-dependent default configuration to the > minimal supported state, thereby avoiding possible miscalculation or > omission of a Domain ID in the CBM string. As shown in the usage flow > below, the new interface drastically reduces the complexity of setting up a > specific configuration: > > # cat /sys/fs/resctrl/info/L3/io_alloc_cbm > 0=ffff;2=ffff;4=ffff;6=ffff;8=ffff;10=ffff;12=ffff;14=ffff;16=ffff;18=ffff;20=ffff;22=ffff;24=ffff;26=ffff;28=ffff;30=ffff;32=ffff;34=ffff;36=ffff;38=ffff;40=ffff;42=ffff;44=ffff;46=ffff;48=ffff;50=ffff;52=ffff > > # echo 0=0;2=0;4=0;6=4;8=4;10=0;12=0;14=0;16=ffff;18=ffff;20=0;22=0;24=0;26=0;28=0;30=0;32=0;34=4;36=0;38=0;40=0;42=0;44=0;46=0;48=0;50=0;52=0 > /sys/fs/resctrl/info/L3/io_alloc_cbm Does the following option work for you? # echo "*=0" > /sys/fs/resctrl/info/L3/io_alloc_cbm Here,|*| represents all domains. This functionality was introduced when adding support for the*"mbm_event" assign mode* (see [1]). [1]https://lore.kernel.org/lkml/b894ad853e6757d40da1469bf9fca4c64684df65.1757108044.git.babu.moger@amd.com/ Also, this needs to be done for all the settings like L3, MBA also SMBA. # echo "L3:*=f" > /sys/fs/resctrl/schemata # echo "MB:*=128" > /sys/fs/resctrl/schemata I’d like to hear from Reinette and Tony if this seems like an acceptable approach. Thanks Babu