Messages in this thread | | | Date | Thu, 05 Feb 2009 12:38:28 -0800 | From | Ben Greear <> | Subject | Re: PATCH: Allow user to force 'tsc' to be treated as stable. |
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Ingo Molnar wrote: > * Ben Greear <greearb@candelatech.com> wrote: > >> Allow user to force TSC as stable clock-source. >> Works around BIOS issues in the FWA-7304 (Via CN700 chipset) >> system, and possibly others. >> >> This is against 2.6.29-rc3. > > What 'issues' does that work around, exactly?
Without this, my system comes up with no stable high-res clock, and the getnstimeofday seems to return something with around 1ms granularity. I have HZ set to 1000, so its probably just using the 'jiffy' clocksource. This in turn screws up my patched version of pktgen and likely is sub-optimal for other things as well.
It seems the TSC on this system is stable, but I got lost trying to understand the watchdog testing code, so I'm not certain if it is wrong or not. With this force in place, the system seems stable and ran overnight under network load fine.
Also, the BIOS on my system seems quite bad about filling out tables, so that may be part of the root cause.
Thanks, Ben
> > Ingo > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Ben Greear <greearb@candelatech.com> Candela Technologies Inc http://www.candelatech.com
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