Messages in this thread | | | Date | Wed, 13 Feb 2002 15:27:56 -0500 | From | Jakub Jelinek <> | Subject | Re: LDT_ENTRIES in ldt.h: why 8192? |
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On Wed, Feb 13, 2002 at 12:18:48PM -0800, Seth D. Alford wrote: > I'm getting "ldt allocation failures" on one of my systems. I know of Manfred > Spraul's patch for this for 2.4.17. I'm using 2.4.12, though, and was > wondering about an alternate solution. What would happen if LDT_ENTRIES was > reduced, to, say, 4096, or 512, instead of 8192? > > .../include/asm-i386/ldt.h specifies: > > /* Maximum number of LDT entries supported. */ > #define LDT_ENTRIES 8192 > > This was set to 8192 in version 0.99.15, in December, 1993, according to what I > could find by retrieving different revisions of the kernel.
E.g. linuxthreads can eat up to 1024 LDT entries, but that's not very common. IMHO there should be a single entry LDT, the emulation 5 entry LDT (current default_ldt), 512 entries LDT (page) and then the full blown 8192 entries LDT variants. Will post a patch once I finish it.
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