Hiroshi Shimamoto writes: > Dave Johnson wrote: > > mach_prepare_counter(); > > It's a really rare case, but if SMI interrupt takes CPU here, just after > prepare and before rdtscll, it makes delta64 shorter than expected one. > Is it possible? And how about moving rdtscll before mach_prepare_counter()? > > > rdtscll(start);
Yep, rare indeed (about 1 instruction). Moving the start read before the prepare call should solve that one too providing the setup doesn't take any real measurable time. -- Dave Johnson Starent Networks - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
