Date: Fri, 2 Dec 2011 15:54:14 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Jason Hellenthal" <jhell@DataIX.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Invalid memory stats from vmstat and sysctl vm.vmtotal? Message-ID: <4EEA489A0AE34B0A98D9A99664551555@multiplay.co.uk> References: <547298A3C38F407887E1AAAAC487DF6D@multiplay.co.uk> <20111201065722.GA97051@DataIX.net> <1A338C6C470940B386C307641E350A3E@multiplay.co.uk> <4ED77650.6050409@my.gd> <A49C89D36C82442CA198847113BD7063@multiplay.co.uk> <20111202070055.GA98731@DataIX.net>
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----- Original Message -----
From: "Jason Hellenthal" <jhell@DataIX.net>
> Just to put some visuals to this...
>
> .
> `-- DIE
> |-- Core1 [Idle]
> |-- Core2 [35% ]
> | `-- thread127
> |-- Core3 [40% ]
> | `-- thread127
> `-- Core4 [100%]
> `-- thread127
>
> In this case you would say the DIE should be at a total of 175% ?
I think your getting confused there; it sounds like your referring to
a single CPU capable of multiple tasks via either multiple cores or
HTT as an UP machine? If so that's your problem this isn't UP it SMP.
Have a look on your machine in /var/run/dmesg.boot if your see
it reporting more than one core then your SMP not UP hence the
confusion as each of these cores be they real, virtual or physical
represents a possible thread of 100% so even if you have a single
physical CPU with 4 cores that still represents a possible total
of 400%
e.g the following shows a machine capable of 1600% if all cores
are busy.
FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs
FreeBSD/SMP: 2 package(s) x 4 core(s) x 2 SMT threads
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu2 (AP): APIC ID: 2
cpu3 (AP): APIC ID: 3
cpu4 (AP): APIC ID: 4
cpu5 (AP): APIC ID: 5
cpu6 (AP): APIC ID: 6
cpu7 (AP): APIC ID: 7
cpu8 (AP): APIC ID: 16
cpu9 (AP): APIC ID: 17
cpu10 (AP): APIC ID: 18
cpu11 (AP): APIC ID: 19
cpu12 (AP): APIC ID: 20
cpu13 (AP): APIC ID: 21
cpu14 (AP): APIC ID: 22
cpu15 (AP): APIC ID: 23
If you want proper UP which will total 100% you could remove
SMP from your kernel but I wouldnt advise that ;-)
Regards
Steve
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