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SubjectRe: Dual XEON - >>SLOW<< on SMP
On Tue, 7 Nov 2000, Jeff V. Merkey wrote:

> Marc Lehman verified that PII systems will generate tons of AGIs with
> gcc. Perhaps this is the cause of this problem. You could run EMON and
> see if there is something obvious in the numbers ...
> Jeff

Here are some tests:

Before the tests, I do:
`ifconfig eth0 down`
`kill -TERM -1`

Then I disconnect my ethernet cable to get rid of those interrupts.

This is the test-script:
make clean
time make -j 10 bzImage

It is executed as `sh &>World.Log &` .

This is Linux 2.4.0-test9

This is a kernel build with NMI watchdog turned OFF:
349.04user 19.83system 3:21.96elapsed 182%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

This is a kernel build with NMI watchdog turned ON:
348.23user 18.84system 3:57.14elapsed 154%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

The elapsed time went from 3:21 to 3:57.

This is Linux 2.2.17

This is the kernel build (the exact same build as above).
214.91user 12.93system 2:37.00elapsed 145%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+0minor)pagefaults 0swaps

The original elapsed time when booting 2.2.17 was 2:37. It is now 3:57.

This is, in every case, rebuilding the exact same kernel.

It doth appearith asthough ithsucks.

Dick Johnson

Penguin : Linux version 2.4.0 on an i686 machine (799.54 BogoMips).

"Memory is like gasoline. You use it up when you are running. Of
course you get it all back when you reboot..."; Actual explanation
obtained from the Micro$oft help desk.

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