From: Peter Zijlstra <peterz@infradead.org>
To: Nicolai Stange <nicstange@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Borislav Petkov <bp@suse.de>,
Paolo Bonzini <pbonzini@redhat.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>,
Len Brown <len.brown@intel.com>,
"Christopher S. Hall" <christopher.s.hall@intel.com>,
Adrian Hunter <adrian.hunter@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error
Date: Wed, 13 Jul 2016 15:49:00 +0200 [thread overview]
Message-ID: <20160713134900.GU30154@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20160713130344.8319-2-nicstange@gmail.com>
On Wed, Jul 13, 2016 at 03:03:42PM +0200, Nicolai Stange wrote:
> clockevents_config_and_register(levt,
> + (u32)(((u64)tsc_khz * 1000) /
> + TSC_DIVISOR),
> 0xF, ~0UL);
div_u64() perhaps ?
next prev parent reply other threads:[~2016-07-13 13:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 13:03 [PATCH v3 0/3] reduce TSC deadline frequency errors Nicolai Stange
2016-07-13 13:03 ` [PATCH v3 1/3] arch, x86, tsc deadline clockevent dev: reduce frequency roundoff error Nicolai Stange
2016-07-13 13:49 ` Peter Zijlstra [this message]
2016-07-13 13:51 ` Paolo Bonzini
2016-07-13 14:31 ` Nicolai Stange
2016-07-13 13:03 ` [PATCH v3 2/3] arch, x86, tsc deadline clockevent dev: reduce TSC_DIVISOR to 2 Nicolai Stange
2016-07-13 13:03 ` [PATCH v3 3/3] arch, x86, tsc: inform TSC deadline clockevent device about recalibration Nicolai Stange
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