Re: Lost Ticks

[Marc Perkel <marc@perkel.com>]

Yeah - there's a patch for that here:

http://bugzilla.kernel.org/show_bug.cgi?id=5105

I haven't tried it yet but will later when I go to the data center. You 
might want to try it and let me know if it actually fixed the problem.

diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(voi
 	   are handled in the OEM check above. */
 	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
 		return 0;
- 	/* All in a single socket - should be synchronized */
- 	if (cpus_weight(cpu_core_map[0]) == num_online_cpus())
- 		return 0;
#endif
 	/* Assume multi socket systems are not synchronized */
 	return num_online_cpus() > 1;


Mizery loves company. I'm glad I'm not the only one with this problem.


Scott Lampert wrote:

> I have the exact same problem on a ASUS A8N-SLI Premium board and 
> Athlon64 4800+ X2 with every BIOS up to 1008-01.  Running with notsc 
> is the only way to get it to work.
>
> As an aside BIOS version 1008-003 is available for this board however 
> this one seems to be WAY worse as the board won't even boot.  It gets 
> panics before the boot messages unless you boot with noapic and after 
> that it gets checksum errors on the RSDP.  I'm afraid to see what the 
> next official BIOS version does. :/
>    -Scott
>
> Frank van Maarseveen wrote:
>
> > On Sun, Sep 18, 2005 at 09:23:40PM -0700, Marc Perkel wrote:
> >  
> >
> > > Got a dual core Athlon 64 X2 on an Asus board using NVidia chipset 
> > > and getting lost ticks. The software clock of course is totally 
> > > messed up. I've scanned google for a solution and see others 
> > > complaining about bad code in the SMM BIOS. I have the latest bios 
> > > and whatever they need to fix - isn't.
> > >
> > > So - what do I do to make it work?
> > >   
> >
> >
> > See http://bugzilla.kernel.org/show_bug.cgi?id=5105
> >
> > On the kernel command-line:
> >
> > x86_64:    try "notsc"
> > i386:    try "clock=pit"
> >
> > "nosmp" works but isn't fun.
> >
> >  
> -
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Marc Perkel - marc@perkel.com

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