8085 2024-01-30 15:53:08 +0000 [devel-6.6] Intel RDT non-contiguous CBM support 2024-03-11 03:11:24 +0000 1 1 5 ANCK ANCK 6.6 Dev X86 unspecified x86_64 Linux RESOLVED FIXED P3-Medium S3-normal --- 1 xiaochen.shen mqaio artie.ding mqaio renyu.zj qingming.su oldest_to_newest 25494 0 xiaochen.shen 2024-01-30 15:53:08 +0000 About Intel RDT non-contiguous CBM support: GNR and SRF support L3/L2 non-contiguous way masks. Linux kernel changes is needed to support this. Legacy RDT only support contiguous bits in L3/L2 CAT Cache Bit Mask (CBM) when allocating L3/L2 cache. For example, 0x111 is a valid bit mask but 0x101 is an invalid bit mask. This is limitation of legacy RDT hardware. It limits user's capability to allocate L3/L2 cache efficiently and cause poor performance. With non-contiguous bits in L3/L2 CAT, we can allocate L3/L2 cache in various ways and utilize the cache efficiently and improve user application performance. About the patches: There are 4 backported upstream patches: aaa5fa35743ab9f0726568611a85e3e15349b9bf Documentation/x86: Document resctrl's new sparse_masks 4dba8f10b8fef9c5b0f9ed83dd1af91a1795ead1 x86/resctrl: Add sparse_masks file in info 0e3cd31f6e9074886dea5a999bfcc563d144e7de x86/resctrl: Enable non-contiguous CBMs in Intel CAT 39c6eed1f61594f737160e498d29673edbd9eefd x86/resctrl: Rename arch_has_sparse_bitmaps 25648 1 yongchao 2024-02-02 00:02:51 +0000 The PR Link: https://gitee.com/anolis/cloud-kernel/pulls/2740 26367 2 xiaochen.shen 2024-03-11 03:04:42 +0000 Mark as FIXED for PR https://gitee.com/anolis/cloud-kernel/pulls/2740 has been merged.