[mythtv-users] MythTV build story, Part II: x86 versus AMD64?

John P Poet jppoet at gmail.com
Fri Sep 15 18:25:08 UTC 2006

On 9/15/06, gLaNDix (Jesse Kaufman) <glandix at lloydnet.org> wrote:
> Richard Krehbiel wrote:
> > I'm (slowly) getting my MythTV box running, and I'm starting to
> > second-guess an earlier decision, specifically to install Fedora Core 5
> > for 32-bit x86.
> >
> > Now, I've been reading about how the x86 version RPMs of .20 were built
> > without MMX enabled, because of which the performance has suffered, and
> > how the 64 bit build didn't have that problem because all x86-64
> > platforms have MMX and SSE and SSE2, and so these technologies are
> > enabled, nay required, by default.
> >
> > And that's led me to think I should reinstall, with 64-bit FC5.
> > Considering I've not even downloaded MythTV yet* this would be the
> > perfect time.
> i'm running FC5 x86_64 on an AMD Athlon64 3400+ box and haven't had a
> single problem regarding the 64-bit processor or the 64-bit OS ...
> before, i was running FC4 32-bit on an Intel Pentium 4 1.6GHz and this
> new system blows it away with just as few problems as I had on the
> original 32-bit hardware.  i haven't had any major show-stopper problems
> w/ 0.20 on FC5 x86_64 and the only problems i've had were cosmetic
> issues w/ mythweb

What is the current state of MMX/SSE on 64bit?

When using Myth's "timestretch" feature, it plays HD material *MUCH*
smoother if I am run the 32bit version of FC5 compared to the 64bit
version of FC5.  I am pretty sure this is because the 64bit version of
that code has MMX disabled.


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