Robert Watson wrote:
On Mon, 5 Feb 2007, Alan Cox wrote:
alc 2007-02-05 06:02:55 UTC
FreeBSD src repository
Modified files:
sys/vm vm_contig.c vm_page.c vm_pageq.c
vm_zeroidle.c
Log:
Change the free page queue lock from a spin mutex to a default
(blocking)
mutex. With the demise of Alpha support, there is no longer a
reason for
it to be a spin mutex.
Is there any measurable performance change from this? In the past,
I've observed significantly higher cost for acquiring spin mutexes vs.
sleep mutexes in micro-benchmarking. The change was most striking on
Intel Xeon P4 hardware with an SMP kernel, and quite a bit less so on
other platforms.
I didn't notice any difference for buildworld on a 4-way Opteron.
Alan
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