Date: Tue, 12 Jun 2007 13:33:25 +0400 (MSD) From: Dmitry Morozovsky <marck@rinet.ru> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: calcru: runtime went backwards, RELENG_6, SMP Message-ID: <20070612132917.I71178@woozle.rinet.ru> In-Reply-To: <200706120213.l5C2DlkO055522@apollo.backplane.com> References: <20070606153542.Y76617@woozle.rinet.ru> <f46tmc$rgb$2@sea.gmane.org> <20070606231940.T91939@woozle.rinet.ru> <200706062127.l56LRYTe090137@apollo.backplane.com> <20070608111809.U97287@woozle.rinet.ru> <200706090809.l5989Mkj020033@apollo.backplane.com> <20070609163329.P4850@woozle.rinet.ru> <200706091957.l59JvDWR026822@apollo.backplane.com> <20070610175748.L88437@woozle.rinet.ru> <20070610193708.W88437@woozle.rinet.ru> <200706120213.l5C2DlkO055522@apollo.backplane.com>
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On Mon, 11 Jun 2007, Matthew Dillon wrote: MD> MD> :============================================================================== MD> : cs3661.rinet.ru 192.38.7.240 2 u 354 1024 377 5.305 -66314. 4321.47 MD> : ns.rinet.ru 130.207.244.240 2 u 365 1024 377 6.913 -66316. 4305.33 MD> : whale.rinet.ru 195.2.64.5 2 u 358 1024 377 7.939 -66308. 4304.90 MD> : MD> :Any directions to debug this? MD> : MD> :Sincerely, MD> :D.Marck [DM5020, MCK-RIPE, DM3-RIPN] MD> MD> Since you are running on HEAD now, could you also kgdb the live kernel MD> and print cpu_ticks? I believe the sequence is (someone correct me if MD> I am wrong): MD> MD> kgdb /kernel /dev/mem MD> print cpu_ticks s,/kernel,/boot/kernel/kernel, ;-) well, strange enough result for me: (kgdb) print cpu_ticks $1 = (cpu_tick_f *) 0xffffffff8036cef0 <rdtsc> Does this mean that kernel uses tsc? sysctl reports kern.timecounter.choice: TSC(-100) ACPI-fast(1000) i8254(0) dummy(-1000000) kern.timecounter.hardware: ACPI-fast MD> As for further tests... try building a non-SMP kernel (i.e. one that MD> only recognizes one cpu) and see if the problem occurs there. That MD> will determine whether there is a basic problem with time keeping or MD> whether it is an issue with SMP. As I'd reported in the first mail, at least RELENG_6/amd64/GENERIC (SMP is on by default only on HEAD) behaves similarly. There may be some hardware issues with this particular mobo though... Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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