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Unless you're on an older, single-core, non-hyperthreading CPU, you shouldn't attempt to rely on TSC as a clock source.<br />
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Multi-core, hyper-threading, and the ability to &quot;sleep&quot; processors all hinder the accuracy of the TSC counter, thus rendering it an unreliable &quot;high resolution&quot; timing source.<br />
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Please provide the environment and requirements, and I'll be happy to help guide you to an appropriate timing source (which may mean additional hardware, depending upon your need for high-resolution and/or dependability (aka: lack of drift))<br />
<br />
Dan<br />
IT4SOHO<br />
<br />
BTW: I think you meant &quot;<b>constant_tsc</b>&quot;
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Yes I did. It's a xen vm so it won't support new hardware. What about jiffies? I have that as a option.
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What can i do if contstance_tsc isnt available? are there any work arounds. i need a very reliable time source. the only available time sources that i see listed are xen and tsc.
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What can i do if contstance_tsc isnt available? are there any work arounds. i need a very reliable time source. the only available time sources that i see listed are xen and tsc.

Unless you&#39;re on an older, single-core, non-hyperthreading CPU, you shouldn&#39;t attempt to rely on TSC as a clock source.

Multi-core, hyper-threading, and the ability to &quot;sleep&quot; processors all hinder the accuracy of the TSC counter, thus rendering it an unreliable &quot;high resolution&quot; timing source.

Please provide the environment and requirements, and I&#39;ll be happy to help guide you to an appropriate timing source (which may mean additional hardware, depending upon your need for high-resolution and/or dependability (aka: lack of drift))

Dan
IT4SOHO

BTW: I think you meant &quot;constant_tsc&quot;

Yes I did. It&#39;s a xen vm so it won&#39;t support new hardware. What about jiffies? I have that as a option.

constance_tsc

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