Date: Sat, 2 May 2009 11:50:52 +0400 From: pluknet <pluknet@gmail.com> To: Jung-uk Kim <jkim@freebsd.org> Cc: freebsd-current@freebsd.org, Jeff Roberson <jroberson@jroberson.net> Subject: Re: cannot compile sched_ule without options SMP Message-ID: <a31046fc0905020050y3d4eef1ao5944b8e4c204514c@mail.gmail.com> In-Reply-To: <200905011610.42613.jkim@FreeBSD.org> References: <20090430013428.cb4f804b.nork@FreeBSD.org> <a31046fc0904301939la407bfek2f342b06c7d3ba29@mail.gmail.com> <a31046fc0904302004r195750f2h586e08d9acf854d1@mail.gmail.com> <200905011610.42613.jkim@FreeBSD.org>
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2009/5/2 Jung-uk Kim <jkim@freebsd.org>: > On Thursday 30 April 2009 11:04 pm, pluknet wrote: >> 2009/5/1 pluknet <pluknet@gmail.com>: >> > 2009/5/1 Jeff Roberson <jroberson@jroberson.net>: >> >> On Thu, 30 Apr 2009, pluknet wrote: >> >>> 2009/4/30 Jeff Roberson <jroberson@jroberson.net>: >> >>>> On SMP machines you should now see output like this: >> >>>> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs >> >>>> FreeBSD/SMP: 1 package(s) x 4 core(s) x 2 SMT threads >> >>>> >> >>>> If you detect any irregularities with kern.sched.topology_spec >> >>>> or this dmesg >> >>>> line please report them. >> >>> >> >>> Hi, Jeff. >> >>> >> >>> I have such mismatch. This is an Intel E7200. >> >>> >> >>> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs >> >>> FreeBSD/SMP: 1 package(s) x 1 core(s) x 2 HTT threads >> >>> cpu0 (BSP): APIC ID: 0 >> >>> cpu1 (AP/HT): APIC ID: 1 >> >>> >> >>> So it should be instead: 1 package(s) x 2 core(s) >> >>> cpu0 (BSP): APIC ID: 0 >> >>> cpu1 (AP): APIC ID: 1 >> >> >> >> Can you please repeat the following steps as I have done here: >> > >> > (kgdb) p/x cpu_high >> > $1 = 0x2 >> > (kgdb) p/x cpu_cores >> > $2 = 0x1 >> > (kgdb) p/x cpu_logical >> > $3 = 0x2 >> > (kgdb) p/x cpu_feature >> > $4 = 0xbfebfbff >> > (kgdb) p/x logical_cpus >> > $5 = 0x2 >> > (kgdb) p/x hyperthreading_cpus >> > $6 = 0x2 >> >> Follow up myself: >> >> What is embarrassing me is HTT feature enabled. May the reason be >> in a buggy CPUID ? > > No, the flag does not mean it supports Hyperthreading. It means more > than one logical core is supported (multi-threading) although the > name didn't change for historical reason. ;-) > I see now. > Can you try the attached patch? > Nice, it works! cpu_mp_probe(): mp_ncpus = 2 FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs FreeBSD/SMP: 1 package(s) x 2 core(s) cpu0 (BSP): APIC ID: 0 cpu1 (AP): APIC ID: 1 (kgdb) p/x cpu_high $1 = 0xa (kgdb) p/x cpu_cores $2 = 0x2 (kgdb) p/x cpu_logical $3 = 0x1 (kgdb) p/x cpu_feature $4 = 0xbfebfbff (kgdb) p/x logical_cpus $5 = 0x2 (kgdb) p/x hyperthreading_cpus $6 = 0x1 -- wbr, pluknet
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