On Mon, Oct 16, 2006 at 07:05:28PM +0100, Chris wrote: > On 15/10/06, Eric Hodel <[EMAIL PROTECTED]> wrote: > >On Oct 13, 2006, at 1:13 PM, Kris Kennaway wrote: > >> On Fri, Oct 13, 2006 at 11:49:04AM -0700, Chuck Swiger wrote: > >>> On Oct 13, 2006, at 11:26 AM, Eric Hodel wrote: > >>>>>> Or did that change recently? > >>>>> > >>>>> It's only on certain systems, apparently. > >>>> > >>>> Is there a list of systems where it is safe to use the TSC with > >>>> SMP? Or some script we can run? > >>> > >>> The problem of the TSC clocks getting out of sync affects pretty much > >>> all AMD X2 dual-core CPUs, as well as the older 32-bit Althon MP > >>> CPUs; the Intel Xeon and Core Duo CPUs seem to do a lot better, > >>> although older Intel CPUs have also been reported to show problems > >>> with the TSC. > >> > >> Beyond that, just see if it works ;-) > > > >How "safe" is it to switch timecounters? I don't have a spare > >machine to test on... > > > > From my readings on switching the TSC over the past several months I > >think that if it doesn't work I'll see is ntpd adjusting my system > >clock more often (or falling out of sync). I don't know if this will > >corrupt mysql while its running though (which is my fear). > > > >FWIW I have a "Dual Core AMD Opteron(tm) Processor 270". > > > >-- > >Eric Hodel - [EMAIL PROTECTED] - http://blog.segment7.net > >This implementation is HODEL-HASH-9600 compliant > > > >http://trackmap.robotcoop.com > > > > > >_______________________________________________ > > I switched from the default timer to TSC on a dual xeon setup and my > loads instantly went up with mysql lagging, so in my case it was much > worse.
This is a very surprising and anomalous result. Can you please provide more details? kris
pgpyqCQFfGSnZ.pgp
Description: PGP signature
