lkml.org 
[lkml]   [2003]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: TSCs are a no-no on i386
    On Wed, 2003-07-30 20:45:29 +0200, Adrian Bunk <bunk@fs.tum.de>
    wrote in message <20030730184529.GE21734@fs.tum.de>:
    > On Wed, Jul 30, 2003 at 11:30:33AM -0700, Mike Fedyk wrote:
    > > On Wed, Jul 30, 2003 at 08:10:06PM +0200, Adrian Bunk wrote:
    > > > On Wed, Jul 30, 2003 at 03:56:23PM +0200, Jan-Benedict Glaw wrote:
    > > > > Please apply. Worst to say, even Debian seems to start using i486+
    > > > > features (ie. libstdc++5 is SIGILLed on Am386 because there's no
    > > > > "lock" insn available)...
    > > >
    > > > Shouldn't the 486 emulation in the latest 386 kernel images in Debian
    > > > unstable take care of this?
    > >
    > > What emulation?
    >
    > 486 emulation
    > CONFIG_CPU_EMU486
    > When used on a 386, Linux can emulate 3 instructions from the 486 set.
    > This allows user space programs compiled for 486 to run on a 386
    > without crashing with a SIGILL. As any emulation, performance will be
    > very low, but since these instruction are not often used, this might
    > not hurt. The emulated instructions are:
    > - bswap (does the same as htonl())
    > - cmpxchg (used in multi-threading, mutex locking)
    > - xadd (rarely used)

    libstdc++ (and it's main user, apt-get) break at a LOCK insn.

    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!
    ret = do_actions((curr | FREE_SPEECH) & ~(IRAQ_WAR_2 | DRM | TCPA));
    [unhandled content-type:application/pgp-signature]
    \
     
     \ /
      Last update: 2005-03-22 13:47    [W:0.023 / U:0.084 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site