Improving SMP performance?

[krad]

On 28 April 2010 04:22, John <john at starfire.mn.org> wrote:

> On Tue, Apr 27, 2010 at 05:32:58PM -0700, Neil Short wrote:
> > I'm somewhat disappointed in the performance in my laptop which is
> supposed to have a really fast processor. Is there some way to get more out
> of the processor?
> >
> >
> > [neshort/] uname -a
> > FreeBSD carmen 8.0-STABLE FreeBSD 8.0-STABLE #1: Thu Apr 15 19:54:24 MST
> 2010     neshort at carmen:/usr/obj/usr/src/sys/CARMEN  i386
> > [neshort/] dmesg
> > ...
> > Timecounter "i8254" frequency 1193182 Hz quality 0
> > CPU: Intel(R) Core(TM) i3 CPU       M 330  @ 2.13GHz (2127.92-MHz
> 686-class CPU)
> >   Origin = "GenuineIntel"  Id = 0x20652  Family = 6  Model = 25  Stepping
> = 2
> >
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
> >
> Features2=0x98e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT>
> >   AMD Features=0x28000000<RDTSCP,LM>
> >   AMD Features2=0x1<LAHF>
> >   TSC: P-state invariant
> > real memory  = 4294967296 (4096 MB)
> > avail memory = 3066707968 (2924 MB)
> > ACPI APIC Table: <HPQOEM SLIC-MPC>
> > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> > FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
> >  cpu0 (BSP): APIC ID:  0
> >  cpu1 (AP): APIC ID:  1
> >  cpu2 (AP): APIC ID:  4
> >  cpu3 (AP): APIC ID:  5
> >
> >
> > ======
> >
> >  "What did you do?" the man holding the flashlight asked.
> >
> >  "I put down a spider," he said, wondering why the man didn't see; in the
> beam of yellow light the spider bloated up larger than life. "So it could
> get away."
> >
>
> In what way are you disappointed?  It may be SMP, but for any single
> thread, it cannot go faster than one of the processors.  If you are
> measuring a single-threaded task, that's all you can get.  Or could
> it be that IO is limiting your performance?  Without knowing what
> it is you want to do, and what you are experiencing, it is very hard
> to know how to help you.  If you are just looking at the clock speed,
> please understand that CPU manufacturers lately are working to LOWER
> clocks speeds because it saves power, and to speed up the processors
> by using wider microinstructions and more sophisticated pipelining
> techniques to gain speed without just wiggling things at a higher
> frequency.
> --
>
> John Lind
> john at starfire.MN.ORG
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put a 64bit os on for one, you would see all your 4g ram then