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[intel] Exclude time spent in hypervisor from profiling

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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;