[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Something about xenalyze
On Fri, Dec 14, 2012 at 8:01 PM, Qi Zhang <cheungrck@xxxxxxxxx> wrote:
The granularity that xentrace reports is only down to the nanosecond; things that happen less than a nanosecond apart may appear to happen at the same time. However, even with a 4GHz clock speed, 1ns is still only 4 clock cycles (if I'm doing my math right) -- it seems unlikely that both trace records could be taken in that time. Did you see any warnings about tsc skew? If you're really keen to track this down, you'd have to do "xenalyze --dump-raw --scatterplot-runstate", so that we could see the raw TSC values for those records, and on what pcpu each ran. -George _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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