XFS error during mount

[Roman Kravets]

Hello!

When I mount my disk with XFS I saw error in dmesg:

Jun 27 11:14:38 softded kernel: XFS (dm-4): xfs_buf_get_uncached: failed to map pages
Jun 27 11:14:38 softded kernel: vmap allocation for size 1048576 failed: use vmalloc=<size> to increase size.
Jun 27 11:14:38 softded kernel: vmap allocation for size 1048576 failed: use vmalloc=<size> to increase size.
Jun 27 11:14:38 softded kernel: vmap allocation for size 1048576 failed: use vmalloc=<size> to increase size.
Jun 27 11:14:38 softded kernel: XFS (dm-4): xfs_buf_get_uncached: failed to map pages
Jun 27 11:14:38 softded kernel: vmap allocation for size 4194304 failed: use vmalloc=<size> to increase size.
Jun 27 11:14:38 softded kernel: XFS (dm-4): xfs_buf_get_uncached: failed to map pages
Jun 27 11:14:38 softded kernel: XFS (dm-4): xfs_buf_get_uncached: failed to map pages
Jun 27 11:14:38 softded kernel: XFS (dm-4): xfs_buf_get_uncached: failed to map pages
Jun 27 11:14:38 softded kernel: XFS (dm-4): Ending clean mount

I have more then 10 millions inodes on partition. My computer: Pentium 4 3GHz and 2 GB memory.
I use Fedora 20 with kernel 3.14.7-200.fc20.i686+PAE

What is it meen "use vmalloc=<size> to increase size"? When can I change it parameter?

Thank you!