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    SubjectRe: TSCs are a no-no on i386
    On Wed, 2003-07-30 16:18:11 +0200, Maciej W. Rozycki <macro@ds2.pg.gda.pl>
    wrote in message <Pine.GSO.3.96.1030730161309.911E-100000@delta.ds2.pg.gda.pl>:
    > On Wed, 30 Jul 2003, Jan-Benedict Glaw wrote:
    > > This small patch fixes a long-standing problem for bare i386 CPUs. These
    > > don't have TSCs and so, a recent 2.4.x kernel will simply halt the
    >
    > Actually i486 processors and some Pentium-like clones have none, too.

    Ah, I didn't know that. Here's the updated patch:


    --- linux-2.4.22-pre9/arch/i386/config.in.orig 2003-07-30 16:38:03.000000000 +0200
    +++ linux-2.4.22-pre9/arch/i386/config.in 2003-07-30 16:39:20.000000000 +0200
    @@ -56,6 +56,7 @@
    define_bool CONFIG_RWSEM_XCHGADD_ALGORITHM n
    define_bool CONFIG_X86_PPRO_FENCE y
    define_bool CONFIG_X86_F00F_WORKS_OK n
    + define_bool CONFIG_X86_HAS_TSC n
    else
    define_bool CONFIG_X86_WP_WORKS_OK y
    define_bool CONFIG_X86_INVLPG y
    @@ -72,6 +73,7 @@
    define_bool CONFIG_X86_ALIGNMENT_16 y
    define_bool CONFIG_X86_PPRO_FENCE y
    define_bool CONFIG_X86_F00F_WORKS_OK n
    + define_bool CONFIG_X86_HAS_TSC n
    fi
    if [ "$CONFIG_M586" = "y" ]; then
    define_int CONFIG_X86_L1_CACHE_SHIFT 5
    @@ -79,6 +81,7 @@
    define_bool CONFIG_X86_ALIGNMENT_16 y
    define_bool CONFIG_X86_PPRO_FENCE y
    define_bool CONFIG_X86_F00F_WORKS_OK n
    + define_bool CONFIG_X86_HAS_TSC n
    fi
    if [ "$CONFIG_M586TSC" = "y" ]; then
    define_int CONFIG_X86_L1_CACHE_SHIFT 5


    MfG, JBG

    --
    Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481
    "Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg
    fuer einen Freien Staat voll Freier Bürger" | im Internet! | im Irak!
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