Date: Tue, 23 Jun 2009 19:19:04 -0400 From: Randall Stewart <rrs@lakerest.net> To: Pierre Guinoiseau <geekounet@poildetroll.net> Cc: Attilio Rao <attilio@freebsd.org>, bf <bf2006a@yahoo.com>, "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-current@freebsd.org, Kip Macy <kmacy@freebsd.org> Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 Message-ID: <2BE0378C-96A3-4714-A5C3-7B1A6AA0DCE2@lakerest.net> In-Reply-To: <4A353E21.1080001@poildetroll.net> References: <951233.95131.qm@web39108.mail.mud.yahoo.com> <3c1674c90905302055g542cfadarf201cc273639977d@mail.gmail.com> <4A23919F.8050905@mail.zedat.fu-berlin.de> <4A2B3040.7020509@poildetroll.net> <3bbf2fe10906070339k663bace7qe5142702248ce6c9@mail.gmail.com> <4A2BBDC0.6000801@poildetroll.net> <3bbf2fe10906070623o65ce021fkb7f59fe1924cc1ec@mail.gmail.com> <4A353E21.1080001@poildetroll.net>
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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 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@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@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-current >> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org >> " > ------------------------------ Randall Stewart 803-317-4952 (cell) 803-345-0391(direct)
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