Messages in this thread | | | Date | Tue, 11 Dec 2007 16:37:06 +0100 | From | Paul Rolland <> | Subject | Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops |
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Hello,
On Tue, 11 Dec 2007 16:28:56 +0100 Rene Herman <rene.herman@keyaccess.nl> wrote:
> On 11-12-07 15:15, Rene Herman wrote: > > > On 11-12-07 14:32, Paul Rolland wrote: > > > This might be a bit more constant, I suppose. This serialises with cpuid. > Don't see a difference locally, but perhaps you do. Well, yes, at least on the PIII and the Opteron... Core2 is still changing a lot...
> On a Duron 1300 with an actual ISA bus, "out" is between 1300 and 1600 for > me and "in" between 1200 and 1500 with a few flukes above that which will I > suppose be caused by the bus (ISA _or_ PCI) being momentarily busy or some > such... The results :
Core 2Duo 1.73 GHz : [root@tux tmp]# ./in2 out: 2777 in : 2519 [root@tux tmp]# ./in2 out: 2440 in : 2391 [root@tux tmp]# ./in2 out: 2460 in : 2388
Pentium III : [root@www-dev /tmp]# ./in2 out: 746 in : 747 [root@www-dev /tmp]# ./in2 out: 746 in : 747 [root@www-dev /tmp]# ./in2 out: 746 in : 745
AMD Opteron 150 : -bash-3.1# ./in2 out: 4846 in : 4845 -bash-3.1# ./in2 out: 4846 in : 4846 -bash-3.1# ./in2 out: 4846 in : 4845
Paul
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