From: "Gong Zhuo" <gongzhuo@163•net>
To: "linuxppc dev" <linuxppc-dev@lists•linuxppc.org>
Subject: How to caculate the MIPS of my MVME2600?
Date: Mon, 21 Aug 2000 16:20:25 +0800 [thread overview]
Message-ID: <011401c00b48$c699e860$4607a8c0@LocalHost> (raw)
Hi:
I am developing program under MVME2600. But I found the program is not as
fast as I think. So I tested my computer board using the mothed like this
and get some impossible results:
* fill the mem from 0x4000 to 0x8000 with instruction 'or r0,r0,r0'
* DEC ==> r3, us counter value ==> r13 at 0x4000
* DEC ==> r4, us counter value ==> r14 at 0x8000
* breakpoint at 0x8008
* go from 0x4000
The display of PPCbug like this:
Copyright Motorola Inc. 1988 - 1997, All Rights Reserved
PPC1 Debugger/Diagnostics Release Version 3.5 - 01/30/98 RM01
COLD Start
Local Memory Found =04000000 (&67108864)
MPU Clock Speed =200Mhz
BUS Clock Speed =67Mhz
WARNING: Keyboard Not Connected
Reset Vector Location : ROM Bank A
Mezzanine Configuration: Single-MPU
Current 60X-Bus Master : MPUIdle MPU(s) : NONE
System Memory: 64MB, ECC Enabled (ECC-Memory Detected)
L2Cache: 256KB
PPC1-Bug>
PPC1-Bug>bf 4000:4000 7c000378 ;w
Effective address: 00004000
Effective count : &65536
PPC1-Bug>as 4000
00004000 3D80FEF8 ADDIS R12,R0,$FEF8?
00004004 81AC0100 LWZ R13,$100(R12) ($00000100)
00004008 7C7602A6 MFSPR R3,22
0000400C 7C000378 OR R0,R0,R0? .
PPC1-Bug>as 8000
00008000 7C9602A6 MFSPR R4,22
00008004 81CC0100 LWZ R14,$100(R12) ($00000100)
00008008 7C000378 OR R0,R0,R0? .
PPC1-Bug>br 8008
BREAKPOINTS
00008008
PPC1-Bug>g 4000
Effective address: 00004000
At Breakpoint
IP =00008008 MSR =00003040 CR =00000000 FPSCR =00000000
R0 =00000000 R1 =03F78000 R2 =00000000 R3 =3F0A7D37
R4 =3F0A64CE R5 =00000000 R6 =00000000 R7 =00000000
R8 =00000000 R9 =00000000 R10 =00000000 R11 =00000000
R12 =FEF80000 R13 =0BF88E8D R14 =0BF89008 R15 =00000000
R16 =00000000 R17 =00000000 R18 =00000000 R19 =00000000
R20 =00000000 R21 =00000000 R22 =00000000 R23 =00000000
R24 =00000000 R25 =00000000 R26 =00000000 R27 =00000000
R28 =00000000 R29 =00000000 R30 =00000000 R31 =00000000
SPR0 =00000000 SPR1 =00000000 SPR8 =00000000 SPR9 =00000000
00008008 7C000378 OR R0,R0,R0
PPC1-Bug>
The result:
r4 -r3 = 0x1869 , r14 - r13 = 0x17B (379us) . There are 0x1000 asm
instruction from 0x4000 to 0x8000 (4096), than the MIPS = 4096/379 = 10MIPS
. It's impossilbe because the MPU is 200Mhz and bus is 67Mhz. The MIPS
should be higher than 200MIPS.
I have made some mistakes? What are they?
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next reply other threads:[~2000-08-21 8:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-21 8:20 Gong Zhuo [this message]
2000-08-21 14:51 ` How to caculate the MIPS of my MVME2600? Gabriel Paubert
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