Dual board - 2. PII 400 MHz very slow

Dual board - 2. PII 400 MHz very slow

Post by H. Trapp » Tue, 28 Jul 1998 04:00:00



I got an IWILL DBL-100 dual PII motherboard with two PII 400Mhz.
When bootimg Linux SMP kernels(2.0.32/33, 2.1.87), the second processor
runs with 3.95 BogoMIPS (the first with 412.12), the machine is very
slow, when using for e.g. make -j. Changing processors and lowering of
bus and/or CPU speed didnt help, single proceesor works alright. NT 4.0
works.
 
 
 

Dual board - 2. PII 400 MHz very slow

Post by Bernhard Kuh » Tue, 28 Jul 1998 04:00:00


: I got an IWILL DBL-100 dual PII motherboard with two PII 400Mhz.
: When bootimg Linux SMP kernels(2.0.32/33, 2.1.87), the second processor
: runs with 3.95 BogoMIPS (the first with 412.12), the machine is very
: slow, when using for e.g. make -j. Changing processors and lowering of
: bus and/or CPU speed didnt help, single proceesor works alright. NT 4.0
: works.

You Motherboards' BIOS doesn't enable the Cache of the 2. CPU at boot-time.
Apply the MTRR-Kernel-Patch (http://www.uk.linux.org/SMP/fix-bios),
and you will be happy again!

tschau

Bernhard

 
 
 

1. 350 MHz vs 400 MHz PII

I'm building a Linux machine and decided to step up to a 400 MHz PII
instead of a 350 MHz even though the price (of the CPU) went from $334
to $483 . . I feel it will be a good long-term move since I plan to
implement software RAID on an array of Ultra2 SCSIs . . so the extra
'crankage' will be welcome.  An even clock multiple of 4x made good
sense to me as well . . I'm putting in 128MB of 8ns ECC.

I have also invested in the Supermicro SC750-A server case . . which
can accomodate up to nine cooling fans . . four of which are for the
HDDs (the four SCSIs in my NT workstation are cooled by the front bay
covers being removed . . letting the air stream over them).  This
SC750 is a unit which I can definitly grow into . .

Any suggestions on a Ultra2 SCSI controller (hope we're not getting
too far off topic) . . I have it narrowed down to the Adaptec 2940U2W
or the Symbios 2951U.  I know the Adaptec is almost 400 bucks!!  but
seems to have more configuration options.  Will probably go with
Viking IIs or perhaps even 'cudas.

2. USR bigpicture videophone

3. PII 400 dual cpu system wont boot when set to 400

4. Linux 2.2.19pre10

5. Dual PII-400 or single PIII-500

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8. VLB IDE contr, VLB ET4000 and network on parrallel port

9. /proc/cpuinfo gives 295 MHz, but 400 MHz chip?

10. UltraSparc AXi 300 MHz versus Pentium II 400 MHz

11. Why Linux slow on 300 MHz G3 with 400 Meg Ram?

12. EXT@-fs panic/general protection and DUAL PII 450 MHZ/SCSI

13. Celeron 300 MHz or PII 266 MHz