Re: Bogomips on AMD X2 (was Re:)

[Michael Concannon <mike@concannon.net>]

Robert.Boermans@uk.telex.com wrote:

> On Wednesday 21 September 2005 16:20, Robert.Boermans@uk.telex.com wrote:
>  
>
> > Hello, 
> >
> > I noticed that the bogomips results for the two cores on my machine are 
> > consistently not the same, the second one is always reported slightly 
> > faster, it's a small difference and I saw the same in a posted dmesg 
> >    
> from 
>  
>
> > somebody else on the list. Which made me wonder: 
> >    
>
> I guess it's a cache warming effect. Please show the numbers.
> --
> vda
>
> Probably not, got this one from a web site, and on this one the first core 
> seems to be faster (can't check my own machine it's off and at home and 
> I'm at work.) The difference I get is similar, but always with the second 
> one faster. It's the same when using cat on /proc/cpuinfo. Oh and I saw it 
> on 2.6.11 and 2.6.12 as supplied with fedora core 4 myself.
>
> Calibrating delay using timer specific routine.. 4014.73 BogoMIPS 
> (lpj=8029470)
> Mount-cache hash table entries: 512
> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
> CPU: L2 Cache: 512K (64 bytes/line)
> CPU 0(2) -> Core 0
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#0.
> mtrr: v2.0 (20020519)
> Enabling fast FPU save and restore... done.
> Enabling unmasked SIMD FPU exception support... done.
> Checking 'hlt' instruction... OK.
> CPU0: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ stepping 02
> Booting processor 1/1 eip 2000
> Initializing CPU#1
> Calibrating delay using timer specific routine.. 4005.37 BogoMIPS 
> (lpj=8010751)
> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
> CPU: L2 Cache: 512K (64 bytes/line)
> CPU 1(2) -> Core 1
> Intel machine check architecture supported.
> Intel machine check reporting enabled on CPU#1.
> CPU1: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ stepping 02
> Total of 2 processors activated (8020.11 BogoMIPS).
>
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>
>  
opposite result here - 2nd one is faster (from /proc/cpuinfo):
processor       : 0
vendor_id       : AuthenticAMD
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
cpu MHz         : 2211.337
bogomips        : 4374.52
...
processor       : 1
vendor_id       : AuthenticAMD
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+
cpu MHz         : 2211.337
...
bogomips        : 4407.29

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/