Hi All, I'm having a problem understanding PAE and low/high memory splits.
in the rhel5 manual http://www.linuxtopia.org/online_books/rhel5/rhel5_administration/rhel5_ch-kernel.html it says (slightly edited): Red Hat Enterprise Linux contains the following kernel packages (some may not apply to your architecture): * kernel — Contains the kernel for multi-processor systems. For x86 system, only the first 4GB of RAM is used. As such, x86 systems with over 4GB of RAM should use the kernel-PAE. * kernel-PAE (only for i686 systems) — This package offers the following key configuration options (in addition to the options already enabled for the kernel package): o Support for over 4GB of RAM (up to 64GB for the x86) o PAE (Physical Address Extension) or 3-level paging on x86 processors that support PAE o 4GB/4GB split: 4GB of virtual address space for the kernel and almost 4GB for each user process on x86 systems but if I check Highor LowTotal/Free on the actual machines with PAE and nonPAE kernel, I see no difference. Or am I looking at the wrong thing? What is the maximum per-process memory under nonPAE and PAE kernel and how do I find out (other than stress testing)? [EMAIL PROTECTED] ~ uname -r 2.6.18-92.1.13.el5PAE [EMAIL PROTECTED] ~ cat /proc/meminfo MemTotal: 4151036 kB MemFree: 688876 kB Buffers: 66576 kB Cached: 1948608 kB SwapCached: 0 kB Active: 2142344 kB Inactive: 1225036 kB HighTotal: 3276592 kB HighFree: 460044 kB LowTotal: 874444 kB LowFree: 228832 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 4416 kB Writeback: 0 kB AnonPages: 1352076 kB Mapped: 28940 kB Slab: 73484 kB PageTables: 10940 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 2075516 kB Committed_AS: 2498464 kB VmallocTotal: 116728 kB VmallocUsed: 2372 kB VmallocChunk: 114152 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB [EMAIL PROTECTED] ~ uname -r 2.6.18-92.1.13.el5 [EMAIL PROTECTED] ~ cat /proc/meminfo MemTotal: 3115756 kB MemFree: 91760 kB Buffers: 18868 kB Cached: 774776 kB SwapCached: 0 kB Active: 2554996 kB Inactive: 409624 kB HighTotal: 2228016 kB HighFree: 4728 kB LowTotal: 887740 kB LowFree: 87032 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 53384 kB Writeback: 108 kB AnonPages: 2170908 kB Mapped: 33120 kB Slab: 45452 kB PageTables: 4108 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 1557876 kB Committed_AS: 2830052 kB VmallocTotal: 114680 kB VmallocUsed: 2360 kB VmallocChunk: 112052 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 4096 kB _______________________________________________ rhelv5-list mailing list rhelv5-list@redhat.com https://www.redhat.com/mailman/listinfo/rhelv5-list
