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    SubjectRe: Speeding up VFS using HW assist

    > I will be using Linux as the OS for an embedded system.
    > I was looking into 2.4.4 kernel code and saw the dcache implementation
    > in VFS which is pretty neat and fast by itself.
    > My question is, will I gain any considerable efficiency in file system
    > access
    > if I can move this "pathname -> inode" lookup into some proprietery
    > HW assist mechanism and take out the dcache hashing and "cached_lookup"
    > function.

    I doubt it will do much difference. How much time is spent in kernel
    in your workload? What kind of embedded system is that?

    > How good(bad) was it before the dcache implementation and in which release
    > was dcache feature added (was it only after 2.2.x release).
    > Did we get 2-3 times better performance with dcache? (if not, how much?)

    I'd be surprised if dcache made more than 20% speedup.

    > Can anyone suggest any other place in the file system (VFS and EXT2) where
    > we
    > can use any HW assist (let us say FPGA implementing search, lookup, etc.)
    > to speed up file-system access (both for opening and read/write)

    Dumping ext2 for reiserfs? ;-)

    Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
    details at

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