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It is refered as io_alloc "refered as" -> "referred to as"? > in resctrl subsystem. > ... > > # Linux Implementation > > Feature adds following interface files when the resctrl "io_alloc" feature is > supported: Please note that, for example when L3 supports io_alloc but L2 does not, the implementation also creates the files for L2 (since it sets flags for all cache resources). "io_alloc" may just be present for resource that does not actually support "io_alloc". (more below) > > /sys/fs/resctrl/info/L3/io_alloc: Reports the feature status. Feature can be > enabled/disabled by writing to the interface. > > /sys/fs/resctrl/info/L3/io_alloc_cbm: Capacity Bit Masks (CBMs) available to SDCI > supported IO devices. CBM can be configured (please use imperative tone throughout) > by writing to the interface in the following > format:: ("in the following format" is not followed by a format example as expected) > # Examples > > a. Check if io_alloc feature is available > #mount -t resctrl resctrl /sys/fs/resctrl/ > > # cat /sys/fs/resctrl/info/L3/io_alloc > 0 Considering that io_alloc will be present for resources that may not support io_alloc I think it may be helpful if it instead display "enabled/disabled/not supported". User space can still interact with the file with typical boolean variants recognized by kstrtobool() > > b. Enable the io_alloc feature. > > # echo 1 > /sys/fs/resctrl/info/L3/io_alloc > > c. Check the CBM values for the io_alloc feature. > > # cat /sys/fs/resctrl/info/L3/io_alloc_cbm > L3:0=ffff;1=ffff Is it expected that more resources may support IO alloc? In above output the resource name is redundant, but if more resources could support IO allocation then it may be more intuitive to move io_alloc_cbm one level up in hierarchy and keep resource name in output in order to potentially manage multiple resources. I do not see impact on feature in current design if files are kept within resource directories, but in that case the name seems redundant. > > d. Change the CBM value for the domain 1: > # echo L3:1=FF > /sys/fs/resctrl/info/L3/io_alloc_cbm > > # cat /sys/fs/resctrl/info/L3/io_alloc_cbm > L3:0=ffff;1=00ff > > d. Disable io_alloc feature and exit. > > # echo 0 > /sys/fs/resctrl/info/L3/io_alloc > #umount /sys/fs/resctrl/ > AMD also supports what is exposed to user space as "shareable_bits". According to APM: Depending on the implementation, some portions of the L3 Cache may be shared by other system functions or used for some other purpose not under the control of the PQOS feature set. The L3 Cache Allocation Sharing Mask returned by CPUID Fn0000_0010_EBX_x1[L3ShareAllocMask] is a bitmask that represents portions of the L3 that may be shared by those functions. Could you please include what (if any) the relationship is between the CBM discoverable via Fn0000_0010_EBX_x1[L3ShareAllocMask] and the CBM of "highest-supported L3_MASK_n register" when SDCIAE is enabled? On the resctrl interface side the documentation currently states: "shareable_bits": Bitmask of shareable resource with other executing entities (e.g. I/O). User can use this when setting up exclusive cache partitions. Note that some platforms support devices that have their own settings for cache use which can over-ride these bits. Even though this was originally used to expose the content of Fn0000_0010_EBX_x1[L3ShareAllocMask] the intent of the content does seem to also apply to the "io_alloc" CBM also. I also expect "bit_usage" to appropriately reflect the io_alloc mask. >From what I can tell SDCIAE does not enforce isolation between hardware and software use of these cache allocations so it does seem to me that the existing legends apply. Reinette