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    SubjectRe: 2.6.9-rc1: scrolling with tdfxfb 5 times slower
    Date
    On Wednesday 01 September 2004 12:51, Antonino A. Daplas wrote:
    > On Wednesday 01 September 2004 18:21, Antonino A. Daplas wrote:
    > > On Wednesday 01 September 2004 15:20, Paolo Ornati wrote:
    > > > Ok, with this patch and CONFIG_FB_3DFX_ACCEL=y the scrolling speed
    > > > comes back (only a bit slower than with 2.6.8.1 without
    > > > CONFIG_FB_3DFX_ACCEL):
    > > >
    > > > $ time cat MAINTAINERS: ~2.67s
    > >
    > > Ok. However, I'm still wondering at the scrolling speed, it's a bit
    > > slower than what I would expect (I get < 1 second with vesafb which is
    > > completely unaccelerated).
    >
    > Ok, I think I know why the scrolling speed is too slow, the driver is not
    > maximizing the extra memory of the framebuffer.
    >
    > This patch sets info->var.yres_virtual to the maximum upon driver load.
    > If this works, it's possible to get sub-1 second scrolling speed.
    >
    > Reverse the previous patch first, then apply this patch.

    Results for 2.6.9-rc1 + your patch (time cat MAINTAINERS):

    CONFIG_FB_3DFX_ACCEL=n
    ~1.27 s

    CONFIG_FB_3DFX_ACCEL=y
    ~0.18 s

    BUT with CONFIG_FB_3DFX_ACCEL enabled I get strange video
    "corruptions" (like bitmaps with random colors) that go away simply
    swithcing to another console and than back to the previous.

    --
    Paolo Ornati
    Gentoo Linux (kernel 2.6.9-rc1)
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