On Fri, 2013-11-29 at 15:12 +0100, Aurelien Jarno wrote:
> On Fri, Nov 29, 2013 at 01:57:39PM +0000, Ben Hutchings wrote:
> > On Fri, 2013-11-29 at 09:22 +0100, Aurelien Jarno wrote:
> > > Some precision about the MIPS machines:
> > >
> > > On Thu, Nov 28, 2013 at 09:04:56PM +0100, Niels Thykier wrote:
> > > > * [mips, mipsel] buildds/porterboxes run on hardware which is very old or has known defects:
> > > > - mips octeon is unstable
> > >
> > > Better me more precise there, Octeon machines in general are very
> > > stable. That said out of the three machines we have in Debian, two are
> > > unstable, the other one is very stable. We never really understood why,
> > > we only have remarked they have different CPU revision number.
> >
> > Whatever, mips has one reliable buildd which is not enough.
>
> Two actually with ball.d.o which is not an octeon.
>
> My point is to say that Octeon boxes are not unstable, but the Octeon
> boxes *we have* as part of the Debian infrastructure are unstable. This
> of course has to be fixed.
Yes.
> > > > - mipsel loongson have CPU bugs
> > >
> > > I see on http://release.debian.org/jessie/arch_qualify.html that it
> > > concerns the "NOP implementation error" from Loongson 2F. Debian is
> > > using Loongson 2E for buildds and porters machines, which are not
> > > affected by this issue.
> >
> > They are affected by that or a very similar issue, as demonstrated by Jo
> > Shields recently: http://apebox.org/wordpress/rants/545/
> >
>
> MUL is a MIPS32 instruction, which is not present on MIPS3 CPUs like the
> Loongson 2, MULT + MFLO should be used instead. There is no CPU bug
> there, it's like trying to build x86 code with SSE4 instructions, and
> then saying that all x86 CPUs which do not support the SSE4 instructions
> are buggy.
That was only the first problem; read the whole entry.
Ben.
--
Ben Hutchings
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- Rachel Kadel, `A Quick Guide to Newsgroup Etiquette'
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