Alexander Motin wrote:
Author: mav
Date: Tue Dec 16 16:04:40 2008
New Revision: 186182
URL: http://svn.freebsd.org/changeset/base/186182
Log:
Call ata_legacy() only once on attach and save it's result. Scanning PCI
configuration registers (which are not going to change) on every interrupt
looks expensive, especially when interrupt is shared. Profiling shows me 3%
of time spent by atapci0 on pure network load due to IRQ sharing with em0.
Nice change. PCI Config registers are exceptionally slow to access on
most systems.
Scott
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