On Mon, 5 Feb 2007, Alan Cox wrote:
alc 2007-02-05 06:02:55 UTCFreeBSD 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.
Robert N M Watson Computer Laboratory University of Cambridge _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
