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[intel] Exclude time spent in hypervisor from profiling 

When profiling, exclude any time spent inside the hypervisor
responding to our MMIO accesses.  This substantially reduces the
variance accumulated on many other profilers.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2014-05-06 22:53:33 +01:00
parent 6f410a16d9
commit abf875a2e5
1 changed files with 3 additions and 0 deletions
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3
src/drivers/net/intel.c
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@ -496,6 +496,7 @@ void intel_refill_rx ( struct intel_nic *intel ) {
profile_start ( &intel_vm_refill_profiler );
writel ( rx_tail, intel->regs + intel->rx.reg + INTEL_xDT );
profile_stop ( &intel_vm_refill_profiler );
profile_exclude ( &intel_vm_refill_profiler );
}
}
@ -634,6 +635,7 @@ int intel_transmit ( struct net_device *netdev, struct io_buffer *iobuf ) {
profile_start ( &intel_vm_tx_profiler );
writel ( tx_tail, intel->regs + intel->tx.reg + INTEL_xDT );
profile_stop ( &intel_vm_tx_profiler );
profile_exclude ( &intel_vm_tx_profiler );
DBGC2 ( intel, "INTEL %p TX %d is [%llx,%llx)\n", intel, tx_idx,
( ( unsigned long long ) address ),
@ -728,6 +730,7 @@ static void intel_poll ( struct net_device *netdev ) {
profile_start ( &intel_vm_poll_profiler );
icr = readl ( intel->regs + INTEL_ICR );
profile_stop ( &intel_vm_poll_profiler );
profile_exclude ( &intel_vm_poll_profiler );
if ( ! icr )
return;