Messages in this thread | | | Date | Wed, 03 Mar 1999 15:03:01 +0000 | From | Fredrick Meunier <> | Subject | What am I doing wrong with /proc/sys/kernel/shmmax? |
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Hi all, I am using Linux 2.2.2 on a 512Mb PII machine with 1Gb swap. I do a echo 335544320 > /proc/sys/kernel/shmmax I can now create a shared memory segment 250Mb in size, and write data into it. When I start reading the memory written I start getting corrupted (-1 and 0 written semi-randomly) then zeroed memory from about 9171328 bytes into the shared memory segment I have allocated. I do not get these problems if I instead edit include/asm-i386/shmparam.h and change SHMMAX to 0x10000000 (although I realise that that may not be a safe change), recompile and install the resultant kernel. What do I need to do to actually change the value of shmmax and have it work?
Thanks for any help, Fred
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