Hi all
I would like to know if in wich degree the issue of unsynced TSCs also applies
on x86 SMP.
Thanks
Ulisses
Debian GNU/Linux: a dream come true
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Depends on your box. Most standard SMP boxes are all clocked off the
same clock, so it's not an issue.
--On Thursday, January 02, 2003 15:44:09 +0100 [email protected] wrote:
> Hi all
>
> I would like to know if in wich degree the issue of unsynced TSCs also
> applies on x86 SMP.
>
> Thanks
>
> Ulisses
>
> Debian GNU/Linux: a dream come true
> -------------------------------------------------------------------------
> ---- "Computers are useless. They can only give answers."
> Pablo Picasso
>
> ---> Visita http://www.valux.org/ para saber acerca de la <---
> ---> Asociaci?n Valenciana de Usuarios de Linux <---
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>
>
On Thu, Jan 02, 2003 at 09:39:40AM -0800, Martin J. Bligh wrote:
> Depends on your box. Most standard SMP boxes are all clocked off the
> same clock, so it's not an issue.
Hi Martin
Thanks for your reply
Is there a way to verify this? or must I contact the motherboard maker and
ask for it? how I should ask it?
Ulisses
>
> --On Thursday, January 02, 2003 15:44:09 +0100 [email protected] wrote:
>
> >Hi all
> >
> >I would like to know if in wich degree the issue of unsynced TSCs also
> >applies on x86 SMP.
> >
> >Thanks
> >
> > Ulisses
> >
> > Debian GNU/Linux: a dream come true
> >-------------------------------------------------------------------------
> >---- "Computers are useless. They can only give answers."
> >Pablo Picasso
> >
> >---> Visita http://www.valux.org/ para saber acerca de la <---
> >---> Asociaci?n Valenciana de Usuarios de Linux <---
> >
> >-
> >To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> >the body of a message to [email protected]
> >More majordomo info at http://vger.kernel.org/majordomo-info.html
> >Please read the FAQ at http://www.tux.org/lkml/
> >
> >
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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--
Debian GNU/Linux: a dream come true
-----------------------------------------------------------------------------
"Computers are useless. They can only give answers." Pablo Picasso
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> Is there a way to verify this? or must I contact the motherboard maker and
> ask for it? how I should ask it?
I'd just assume that it works unless you have > 4 CPUs. Boxes (like mine)
where it doesn't work tend to be arcane NUMA things with large CPU counts.
M.
On Fri, Jan 03, 2003 at 05:52:55PM -0500, Mark Hahn wrote:
Hi Mark
> > > Depends on your box. Most standard SMP boxes are all clocked off the
> > > same clock, so it's not an issue.
> >
> > Hi Martin
> >
> > Thanks for your reply
> >
> > Is there a way to verify this? or must I contact the motherboard maker and
> > ask for it? how I should ask it?
>
> any SMP less than $50k is using a single clock to drive the CPUs,
> and therefore has TSC's in sync. if you owned a numa/clustered
> SMP, you'd know it - they're the only ones that need something special.
Thanks for your reply
I think that CONFIG_X86_TSC_DISABLE should be more informative on this
Ulisses
Debian GNU/Linux: a dream come true
-----------------------------------------------------------------------------
"Computers are useless. They can only give answers." Pablo Picasso
---> Visita http://www.valux.org/ para saber acerca de la <---
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On Fri, Jan 03, 2003 at 06:01:13PM -0500, Mark Hahn wrote:
> > I think that CONFIG_X86_TSC_DISABLE should be more informative on this
>
> at most, it should say "don't worry about this unless you need to.
> and you'll know it if you need to".
And It should say that the kernel test TSCs are syncroniced across CPUS at
boot time, which I've just have found:
The message is the following in a 2.4.19-pre6 kernel
checking TSC synchronization across CPUs: passed.
I hope this helps somebody
Ulisses
Debian GNU/Linux: a dream come true
-----------------------------------------------------------------------------
"Computers are useless. They can only give answers." Pablo Picasso
---> Visita http://www.valux.org/ para saber acerca de la <---
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