On Tue, 23 Jun 2009, Randall Stewart wrote: > One thing I have noticed for a while.. and have not > been able to track down.. > > If one runs > > /usr/src/tools/tools/syscall_timing/syscall_timing > > On a 7.2 kernel and compare it on the same machine to an 8.0 kernel > you will see almost a 3x slow down in 8. > > Yes I have 8.0 without witness and all the debug. The thing > that is most interesting is I even ran 8 on a 7.2 user space... > same result. > > My AMD 64 1.6Gig 8 core machines (in SMP) are showing > > 250ns or so for getuid 1000 times on 7.2 > and > 880ns or so for getuid 1000 times on 8.0 This is due to Kib's segment changes in current. I found it with hwpmc and he has produced a patch which fixes it. It will be in after beta 1. Thank you for reporting it. Jeff > > I started tracking this in 7.1.. > > When I get some more time next week I will do some more digging.. not sure > its related to this issue though > > R > > On Jun 14, 2009, at 2:14 PM, Pierre Guinoiseau wrote: > >> Hi again, >> >> I don't know if it can be of better help or not, but I made 2 other >> dumps, before and after the slowdown, and without X running and all... I >> recompiled some packages several times to make the slowdown appear. >> >> The dumps are here : http://foo.poildetroll.net/freebsd/ktr/ >> >> Thanks again for your help! >> >> Pierre Guinoiseau >> >> >> Attilio Rao wrote: >>> 2009/6/7 Pierre Guinoiseau <geekounet_at_poildetroll.net>: >>>> Ok, here is a ktr output. This time, the slowdown appeared while >>>> recompiling thunderbird. I have 2 core at 2.2Ghz (and powerd running, I >>>> don't know if it matters). >>>> >>>> BTW, what is the use of py-tkinter ? If it was in order to cause the >>>> bug, it failed, it needed a higher load. :) >>> >>> Ah sorry, I was supposed to let you run schedgraph but I'm going to do >>> that, so you actually didn't need it >>> I will let you know if something cames up. >>> If others can report the same it will be great. >>> >>> Thanks, >>> Attilio >>> _______________________________________________ >>> 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" >> > > ------------------------------ > Randall Stewart > 803-317-4952 (cell) > 803-345-0391(direct) > > _______________________________________________ > 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 Thu Jul 02 2009 - 02:03:55 UTC
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