Hugetlbfs support error.

[atoka wotsa <atokawotsa@xxxxxxxxxxx>]

hi everyone,

 

- I compiled Linux kernel 2.6.18 with hugetlbfs support on fedora core 5 and the compilation was successful.

- I then runned the following commands to mount the hugetlbfs filesystem and set the numbers of hugepages in the system.

           - First i tried   cat /proc/meminfo   command and i got

                 HugePages_Total: 0
                 HugePages_Free:  0
                 HugePages_Rsvd:  0
                 Hugepagesize:    2048 kB

 

           - Then    cat /proc/sys/vm/nr_hugepages  (indicates the
current number of configured hugetlb) command and i got 0 as output.

           - So i tried mounting the filesystem of type hugetlbfs by
using the command mount none /mnt/huge -t hugetlbfs   and it got
mounted.

           - Then i used    echo 10 > /proc/sys/vm/nr_hugepages
to configure 10 hugepages in the system. and again tried       cat /proc/sys/vm/nr_hugepages and i got 1 as output.
where it should have be 10.

 

           - i then tried to copy any temporary file to the mounted directory but it
signaled "insufficient memory".

 

Can anyone tell me why it gave 1 instead of 10 after      echo 10 > /proc/sys/vm/nr_hugepages   command ?

and also why it gave "insufficient memory" signal ?

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