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openEuler 22.03 ARM架构 PAGE_SIZE 选择 4k or 64K
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#I4HDHZ
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gameoverboss
Opened this issue
2021-11-08 17:33
从性能和内存消耗权衡角度, 支持更多ARM芯片角度; 建议openEuler ARM架构选择4K页表; redhat从RHEL9开始选择4K页表作为ARM架构的默认页表 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9-beta/html-single/9.0_release_notes/index The 64-bit ARM architecture has a 4 KB page size in RHEL 9 Red Hat has selected a 4 KB page size of physical memory for the 64-bit ARM architecture in Red Hat Enterprise Linux 9. This size pairs well with the workloads and memory amounts present on the majority of ARM-based systems. To employ large page sizes efficiently, use the huge pages option to address a greater amount of memory or workloads with large data sets. 客户希望redhat支持 Apple Silicon (M1) Processor诉求, M1芯片仅支持4K页表; https://access.redhat.com/discussions/5966451 其他问题: 1.某些硬件厂商, TCP offload网卡, 驱动和微码里边将page_size写死为4096; 如果不是4K页表, 运行会出错; 2.用户态软件, 兼容多个OS的时候, 如果页表不同, 会导致mmap相关系统调用不兼容; 3.如果使用64K页表, 会导致内核内存底噪增加; 4.如果用户态软件使用LWT协程, 协程的堆栈基于page_fault动态增长, 则64K页表会浪费大量内存;
从性能和内存消耗权衡角度, 支持更多ARM芯片角度; 建议openEuler ARM架构选择4K页表; redhat从RHEL9开始选择4K页表作为ARM架构的默认页表 https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9-beta/html-single/9.0_release_notes/index The 64-bit ARM architecture has a 4 KB page size in RHEL 9 Red Hat has selected a 4 KB page size of physical memory for the 64-bit ARM architecture in Red Hat Enterprise Linux 9. This size pairs well with the workloads and memory amounts present on the majority of ARM-based systems. To employ large page sizes efficiently, use the huge pages option to address a greater amount of memory or workloads with large data sets. 客户希望redhat支持 Apple Silicon (M1) Processor诉求, M1芯片仅支持4K页表; https://access.redhat.com/discussions/5966451 其他问题: 1.某些硬件厂商, TCP offload网卡, 驱动和微码里边将page_size写死为4096; 如果不是4K页表, 运行会出错; 2.用户态软件, 兼容多个OS的时候, 如果页表不同, 会导致mmap相关系统调用不兼容; 3.如果使用64K页表, 会导致内核内存底噪增加; 4.如果用户态软件使用LWT协程, 协程的堆栈基于page_fault动态增长, 则64K页表会浪费大量内存;
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