On Fri, October 5, 2007 02:43, Jeff Roberson wrote: > > On Wed, 3 Oct 2007, Gelsema, P (Patrick) - FreeBSD wrote: > >> On Wed, October 3, 2007 17:07, Nick Evans wrote: >>> On Tue, 2 Oct 2007 16:53:33 -0700 (PDT) >>> Jeff Roberson <jroberson_at_chesapeake.net> wrote: >>> >>>> Enclosed is a patch that does two things: >>>> >>>> 1) Reduces UP context switch time by over 10% making it faster than >>>> 4BSD >>>> on UP. On SMP it's hard to compare since ULE can do as many as 30x as >>>> many switches per second on my 8way system. >>>> >>>> 2) Restores old sched_yield() behavior from 6.x. This was changed in >>>> -current unintentionally I think. >>>> >>>> I'd appreciate any extra testing. The ULE context switch time >>>> improvements required some changes to the frequency that we >>>> recalculate >>>> priorities. I'm mostly interested in hearing whether this causes any >>>> regression in normal workloads. >>>> >>>> Those of you still using 4BSD can also verify that the yield changes >>>> don't >>>> cause any problems there. >>>> >>>> Thanks, >>>> Jeff >>> >>> Jeff, >>> >>> I haven't noticed any adverse affects with this patch on yesterdays >>> CURRENT+ULE. System is a Pentium D 915 with 1 gig ram. Built a bunch of >>> larger >>> ports while browsing in firefox and setting up enlightenment-devel, >>> interactivity was good. Enlightenment's eye-candy stayed very fluid. >>> >>> Nick >>> _______________________________________________ >>> freebsd-current_at_freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-current >>> To unsubscribe, send any mail to >>> "freebsd-current-unsubscribe_at_freebsd.org" >>> >> >> Hi, >> >> Running -current as of tuesdaynight CET. >> >> FreeBSD hulk.superhero.nl 7.0-CURRENT FreeBSD 7.0-CURRENT #4: Wed Oct 3 >> 08:19:30 UTC 2007 >> root_at_hulk.superhero.nl:/usr/obj/usr/src/sys/GENERIC >> amd64 >> >> I've done the following (had to as I did not have the actual diff >> available): >> >> copy text from >> http://lists.freebsd.org/pipermail/freebsd-current/attachments/20071002/30d18099/yield-0001.bin >> into a file saved in /tmp >> >> #cd /usr/src >> #patch < /tmp/patchile >> >> I had to tell the patch with which files I wanted the patchfiles to >> compare with. Found this weird but they did apply correctly. >> >> I've recompiled my Kernel with SCHED_ULE and rebooted. >> >> After boot I got up to the login window after which it instantly paniced >> with: panic: Invalid priority 128 on timeshare runq > > I believe I have fixed this bug in the enclosed patch. It is rooted from > /usr/src/sys so you should cd there to apply it. > Patched, rebuild everything and rebooted. No issues so far. I do not notice any improvement performance wise (don't know if I should be expecting any): On amd64 patched ULE (with all debugging options on, GENERIC kernel with only the scheduler changed): time make -j16 buildworld 4722.703u 2542.486s 1:04:55.26 186.5% 6060+1295k 23195+8330io 3400pf+0w time make -j8 buildworld 4704.547u 2567.041s 1:04:15.68 188.5% 6049+1293k 2289+8296io 1085pf+0w Without the patch it takes about the same time for make -j16. Maybe 1 or 2 minutes longer. before each run I did the below: cd /usr/src && rm -rf /usr/obj && make clean && make clean I can't run a lot of tests as I am logged on remote. If you want me to try certain tests please let me know. Rgds, Patrick > Thanks, > Jeff > >> >> Maybe this error was caused by the method of patching used by me? Can >> you >> please provide me the patch again by email, if this could solve the >> issue. >> >> If more information is required I am more than happy to provide. >> >> Rgds, >> >> Patrick >> >> _______________________________________________ >> freebsd-current_at_freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-current >> To unsubscribe, send any mail to >> "freebsd-current-unsubscribe_at_freebsd.org" >>_______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"Received on Fri Oct 05 2007 - 13:19:21 UTC
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