lkml.org 
[lkml]   [2003]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: mounting 4000 disks
    Badari Pulavarty <pbadari@us.ibm.com> wrote:
    >
    > Hi,
    >
    > I have been playing with testing 4000 disk support. (using 32bit dev_t).
    >
    > I created 4000 disks using scsi_debug and mounted them.
    > We consumed 84MB of low memory by just mouting 4000 filesystems.
    > Out of 84MB lowmem 48MB is in slabs. 33 MB is used by buffers.

    20 kbytes per disk+filesystem seems reasonable.

    The "Buffers" will be the superblock (4k) and the group descriptor blocks
    (256 bytes per gigabyte of disk). These are pinned memory.

    And the ext2 superblock got bigger in -mm due to the recent scalability
    patches.

    What is using the "size-8192" allocation there? It could be the ext2 superblock
    if you have NR_CPUS=32.
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:34    [W:3.440 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site