Messages in this thread | | | Date | Sat, 23 Jul 2005 18:09:37 -0400 (EDT) | From | Gaspar Bakos <> | Subject | Re: kernel page size explanation |
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Hi, Jesper,
RE: > > 2. how can one tune it (for 2.6.*)? > > For some archs the page size can be set at compile-time with > CONFIG_PAGE_SIZE_4KB, CONFIG_PAGE_SIZE_8KB etc - mips is an example of > such an arch (also take a look at CONFIG_HUGETLB_PAGE and friends).
OK, now i figured it out. On AMD opteron 64 bit processors the only option is the default: 4Kb. For itanium and mips, indeed, there are multiple options. My CPUs are opteron 64 bit ones; that is why i was not able to find this feature (of tuning it).
> > How can i figure out the page size of the kernel i am currently using? > > > You can > A) look in the .config file for your current kernel (if your arch > supports different page sizes at all).
Not there.
> C) You can look at /proc/cpuinfo or /proc/meminfo , IIRC some archs > report page size there - not quite sure, can't remember...
Probably not in meminfo, but possibly in cpuinfo:
cat /proc/cpuinfo ... TLB size : 1024 4K pages ...
cat /proc/meminfo MemTotal: 4010956 kB MemFree: 3848060 kB Buffers: 0 kB Cached: 45696 kB SwapCached: 0 kB Active: 90432 kB Inactive: 4820 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 4010956 kB LowFree: 3848060 kB SwapTotal: 7823576 kB SwapFree: 7823352 kB Dirty: 20 kB Writeback: 0 kB Mapped: 78668 kB Slab: 46216 kB CommitLimit: 9829052 kB Committed_AS: 142036 kB PageTables: 3252 kB VmallocTotal: 34359738367 kB VmallocUsed: 5724 kB VmallocChunk: 34359732179 kB HugePages_Total: 0 HugePages_Free: 0 Hugepagesize: 2048 kB
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