lkml.org 
[lkml]   [1998]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: IDE-DMA strangeness (another one)
    On Tue, 1 Dec 1998, Alex Buell wrote:
    > On Tue, 1 Dec 1998, Rik van Riel wrote:
    >
    > > With this move I saw in improvement (hdparm -t) from 3
    > > to 8.4 (!) MB/second... Now I wonder what kind of bug
    > > in the Linux I/O subsystem could hold performance back
    > > _that_ badly.
    >
    > Makes a lot of sense if your old IDE disk was PIO only and the newer
    > IDE uses DMA.

    All IDE devices in my box are DMA2 capable.

    > My machine exhibited the same speedup when I swapped around my old
    > PIO IDE and my spankin' new UMDA IDE hard disks. (It's stuck in DMA
    > though as PIIX3 chipset doesn't support UDMA - guess I'll have to
    > buy a Promise UDMA33 controller someday!)

    I'm working with an (apparently buggy) PIIX mobo. It's
    certainly fast enough not to be saturated by the HDs
    or the CD.

    cheers,

    Rik -- now completely used to dvorak kbd layout...
    +-------------------------------------------------------------------+
    | Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
    | Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
    +-------------------------------------------------------------------+


    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.rutgers.edu
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:45    [W:0.022 / U:0.192 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site