From: john stultz <johnstul@us.ibm.com>
To: Jesper Dangaard Brouer <hawk@diku.dk>
Cc: Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, netdev <netdev@vger.kernel.org>,
Len Brown <len.brown@intel.com>,
Shaohua Li <shaohua.li@intel.com>,
hawk@comx.dk
Subject: Re: TSC unstable due to TSC halts in idle?
Date: Fri, 14 May 2010 15:28:31 -0700 [thread overview]
Message-ID: <AANLkTimeXEaUnzSBuilbQLHj_oho3ia9EgyPGpB7vJRI@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.64.1005142208290.6220@ask.diku.dk>
On Fri, May 14, 2010 at 1:13 PM, Jesper Dangaard Brouer <hawk@diku.dk> wrote:
> I want to know, if its safe to enable the TSC clocksource, when the
> kernel reports:
> "Marking TSC unstable due to TSC halts in idle"
>
> The system selects HPET (in current_clocksource), but I can still see
> TSC as an available clocksource (in
> /sys/devices/system/clocksource/clocksource0/available_clocksource).
>
> Is it safe to enable TSC manually (by changing current_clocksource)?
> (my workload is 10Git/s routing, cannot survive with a slow clock)
>
>
> Any trick to avoid this? (e.g. kernel config setting, or a /sys/ setting
> which changes the minimum P-state?)
Might try booting with the max-cstate=1 option.
thanks
-john
next prev parent reply other threads:[~2010-05-14 22:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-14 20:13 TSC unstable due to TSC halts in idle? Jesper Dangaard Brouer
2010-05-14 22:28 ` john stultz [this message]
2010-05-14 23:15 ` Suresh Siddha
2010-05-15 9:54 ` Jesper Dangaard Brouer
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