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Re: SVN 1.0.0 with FC1 on <=586 CPU

From: Toshio <toshio_at_tiki-lounge.com>
Date: 2004-03-06 20:30:45 CET

Well, I've done a lot of googling today and I think I've got some
answers that can help explain things.

* Fedora's db4 and thus subversion is compiled to use NPTL
* NPTL is part of linux 2.6 and Redhat patched 2.4
* NPTL works on i486 and above processors
* NPTL requires support in glibc
* glibc compiled for i386 does not support NPTL
* Redhat/Fedora Core 1 ships glibc for i386 and i686

So for Redhat9/FC1 if you have an i686 or above with the right kind of
kernel and the i686 glibc you can run subversion out of the box.

If you have an i386 you have to patch your db4 compile to
--disableposixmutexes.

If you have an i486 to i586 you have a system that could potientially
have NPTL but doesn't because Redhat didn't supply a glibc RPM for it.
You can either compile glibc to include NPTL on your system or compile
db4 to not include NPTL.

Barry Nathan seems to have compiled some glibc packages with NPTL
support. It looks like the most recent package is from the first update
(101.1 -- currently at 101.4). If you use them, drop him a note... I
think he wants to know if they work and are helpful.

http://math.uci.edu/~bnathan/linux/glibc/

-Toshio

On Sat, 2004-03-06 at 12:16, C. Heilman wrote:
> Oops! My Pentium box isn't a PII, it's a Pentium MMX - but it IS a 586.
> PIIs are 686s.
> So this holds with <=586 CPUs need a DB4 without the nptl.
>
>
> Chet
>
>
> Toshio wrote:
>
> >My AMDK6-233 needs to have the patched db4 in order to run.
> >
> >I'm running SVN 0.37 with standard FC1 db4 on a P-II without problems:
> >from /proc/cpuinfo:
> >vendor_id : GenuineIntel
> >cpu family : 6
> >model : 5
> >model name : Pentium II (Deschutes)
> >stepping : 2
> >cpu MHz : 266.623
> >
> >Do you have the glibc package compiled for i386 or for i686? db4
> >--enable-posixmutexes requires NPTL in order to function. This in turn
> >requires kernel-2.6 (or RedHat's patched 2.4) and glibc compiled with
> >NPTL support. Redhat has enabled this for their i686 build but not
> >i386.
> >
> >-Toshio
> >
> >On Sat, 2004-03-06 at 10:11, C. Heilman wrote:
> >
> >
> >> I don't know why. But is seems to be the case. The SVN 0.32, which
> >>came with FC1 did not work from the start. The db4.1 package below got
> >>SVN0.32 working. I just more or less did the same thing with db4.2 to
> >>make SVN 1.0.0 work with David Summers' RPMs.
> >>
> >> Is anyone else running SVN 1.0.0 / FC1 on a 586 or lower CPU? Is
> >>anyone running SVN 0.32 / FC1 on one without the patched db4, below?
> >>
> >>
> >>Chet
> >>
> >>Bugzilla:
> >>https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=91933
> >>Download link for db4.1 RPMS:
> >>http://tomi.nomi.cz/download/db4-no-nptl/
> >>
> >>
> >>
> >>
> >>
> >>>C. Heilman wrote:
> >>>
> >>>
> >>>
> >>>
> >>>> I've had a lot of problems with SVN and FC1, in general, mostly
> >>>>because of my old hardware (AMDK2-400 and PII-200). Apparently there are
> >>>>problems with the NPTL on these CPUs - at least in Fedora. (Thanks
> >>>>again, Toshio, for pointing me in the right direction.)
> >>>>
> >>>>
> >>>>
> >>>Florian Weimer wrote:
> >>>
> >>>
> >>>
> >>>This is quite strange, because both CPUs implement the P54C opcodes.
> >>>I'm less sure about the the P55C opcodes (aka MMX), but these shouldn't
> >>>matter anyway.
> >>>
> >>>I'm not aware of any NPTL variant which doesn't run on your CPUs. Keep
> >>>in mind that your Pentium II even supports CMOV.
> >>>
> >>>
> >>>
> >>>
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> >>
>
>
>
>
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-- 
Toshio <toshio@tiki-lounge.com>
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Received on Sat Mar 6 20:31:15 2004

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