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    SubjectRe: SMP update: 2.1.30

    On Sat, 29 Mar 1997, Mark Hemment wrote:

    > 2.1.30 sucks up system time (at least on my 486DX33 8MB test target).
    > When compiling a kernel, 2.1.30 spends almost 50% more time inside the
    > kernel than 2.1.29.

    have you turned SMP off in the top Makefile? LCT#15 (Linus Cute Trick #15)

    > The problem is the change of search order in get_empty_inode(). Changing
    > i_prev back to i_next resolves the problem.
    > Ingo, wasn't this a performance change for NFS?

    duh. nope. wait, does the following help:

    --- linux-2.1.30_vanilla/fs/inode.c Fri Mar 28 12:31:53 1997
    +++ linux/fs/inode.c Sat Mar 29 12:20:43 1997
    @@ -523,6 +523,7 @@
    if (best->i_count)
    goto repeat;
    + first_inode = best;
    best->i_count = 1;
    best->i_nlink = 1;
    the problem is that free inodes are inserted in chunks, and
    get_free_inode() gets the wrong end ... by moving first_inode we can get
    around this: free inodes get always inserted before first_inode and we
    search the list backwards.

    ( i've noticed this one, but Thomas Schoebel-Theuer wrote me about his new
    inode implementation, so i didnt care about it. Then Linus put my
    half-done patch suggestion into 2.1.30 ... )

    please tell me if this fixes the problem so i can post it to linux-kernel.


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