With CONFIG_PARAVIRT turned on, I've found that time invoking system_call jumped up quite a lot. Using TCP streaming test as a workload and running on 32-bit 2.6.20 kernel, system_call goes up from 0.00025% all the way to 1.6% in the oprofile data. There is a drop of about 4% in overall throughput for this particular workload.
With lmbench's null system call test, the call time goes up from 0.10 usec to 0.225 usec. I'm testing on dual socket Intel core 2 processor running at 2.67 GHz with 4 GB RAM. Tim - 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/