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SubjectRe: [PATCHSET] Linux 2.4.19-pre7-jam1
Date
J.A. Magallon wrote:

[-]
> Rest as usual, O1-sched-k3 (is any backport of the updates planned ??)
> mini-low-lat, splitted-vm-33, bproc-3.1.9.

Have you ever done any "regression testing" with your -jam patch?

Then you should have found very very bad latency behavior with O(1)-K3
applied! Even Alan's -ac series (including the latest O(1)-K3 patch) is
shocked.

No uptodate O(1) patch for 2.4. Very sad.
So there isn't any change to see a current preemption patch on top of vm33 and
O(1).

No, lowlatency didn't come close to preemption+lock-break (best latency
numbers for 2.4.17-preX-rml, were ~2.9ms max).

I'm under the impression that "all" development is focused on 2.5.x, now.
Even the VM stuff show no mayor growth ;-(

Additional latencytest0.42-png numbers for both kernels are available.

Thanks,
Dieter

2.4.19-pre7-dn1
splitted vm33
23-lowlatency-mini
24-lowlatency-fixes-5
25-read-latency-2

SunWave1 dbench/latencytest0.42-png# time ./do_tests none 3 256 0 350000000
x11perf - X11 performance program, version 1.5
The XFree86 Project, Inc server version 40200000 on :0.0
from SunWave1
Thu Apr 18 21:03:48 2002

Sync time adjustment is 0.2185 msecs.

3000 reps @ 2.2690 msec ( 441.0/sec): Scroll 500x500 pixels
3000 reps @ 2.2747 msec ( 440.0/sec): Scroll 500x500 pixels
3000 reps @ 2.2709 msec ( 440.0/sec): Scroll 500x500 pixels
3000 reps @ 2.2697 msec ( 441.0/sec): Scroll 500x500 pixels
3000 reps @ 2.2771 msec ( 439.0/sec): Scroll 500x500 pixels
15000 trep @ 2.2723 msec ( 440.0/sec): Scroll 500x500 pixels

800 reps @ 11.8050 msec ( 84.7/sec): ShmPutImage 500x500 square
800 reps @ 11.8099 msec ( 84.7/sec): ShmPutImage 500x500 square
800 reps @ 11.9632 msec ( 83.6/sec): ShmPutImage 500x500 square
800 reps @ 11.8041 msec ( 84.7/sec): ShmPutImage 500x500 square
800 reps @ 11.8199 msec ( 84.6/sec): ShmPutImage 500x500 square
4000 trep @ 11.8404 msec ( 84.5/sec): ShmPutImage 500x500 square

fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
4.2ms ( 0)|
1MS num_time_samples=64412 num_times_within_1ms=62014 factor=96.277091
2MS num_time_samples=64412 num_times_within_2ms=64403 factor=99.986027
PIXEL_PER_MS=103
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
4.2ms ( 0)|
1MS num_time_samples=20748 num_times_within_1ms=20050 factor=96.635820
2MS num_time_samples=20748 num_times_within_2ms=20746 factor=99.990361
PIXEL_PER_MS=103
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
4.5ms ( 1)|
1MS num_time_samples=10451 num_times_within_1ms=10007 factor=95.751603
2MS num_time_samples=10451 num_times_within_2ms=10436 factor=99.856473
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 18 21:06 tmpfile
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
7.8ms ( 4)|
1MS num_time_samples=21423 num_times_within_1ms=20546 factor=95.906269
2MS num_time_samples=21423 num_times_within_2ms=21411 factor=99.943985
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 18 21:06 tmpfile
-rw-r--r-- 1 root root 350000000 Apr 18 21:07 tmpfile2
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
4.4ms ( 1)|
1MS num_time_samples=16340 num_times_within_1ms=15597 factor=95.452876
2MS num_time_samples=16340 num_times_within_2ms=16324 factor=99.902081
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 18 21:06 tmpfile
-rw-r--r-- 1 root root 350000000 Apr 18 21:07 tmpfile2
109.610u 17.740s 4:03.41 52.3% 0+0k 0+0io 10444pf+0w

*******************************************************************************

2.4.19-pre7-dn1
splitted vm33
23-lowlatency-mini
24-lowlatency-fixes-5
25-read-latency-2

20-sched-O1-K3
21-sched-balance
22-sched-aa-fixes

SunWave1 dbench/latencytest0.42-png# time ./do_tests none 3 256 0 350000000
x11perf - X11 performance program, version 1.5
The XFree86 Project, Inc server version 40200000 on :0.0
from SunWave1
Fri Apr 19 00:40:11 2002

Sync time adjustment is 0.1351 msecs.

3000 reps @ 1.8390 msec ( 544.0/sec): Scroll 500x500 pixels
3000 reps @ 1.6942 msec ( 590.0/sec): Scroll 500x500 pixels
3000 reps @ 1.6915 msec ( 591.0/sec): Scroll 500x500 pixels
3000 reps @ 1.6962 msec ( 590.0/sec): Scroll 500x500 pixels
3000 reps @ 1.6949 msec ( 590.0/sec): Scroll 500x500 pixels
15000 trep @ 1.7231 msec ( 580.0/sec): Scroll 500x500 pixels

1200 reps @ 5.2230 msec ( 191.0/sec): ShmPutImage 500x500 square
1200 reps @ 5.2480 msec ( 191.0/sec): ShmPutImage 500x500 square
1200 reps @ 5.2290 msec ( 191.0/sec): ShmPutImage 500x500 square
1200 reps @ 5.2355 msec ( 191.0/sec): ShmPutImage 500x500 square
1200 reps @ 5.2289 msec ( 191.0/sec): ShmPutImage 500x500 square
6000 trep @ 5.2328 msec ( 191.0/sec): ShmPutImage 500x500 square

fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
247.4ms (423)|
1MS num_time_samples=6079 num_times_within_1ms=5462 factor=89.850304
2MS num_time_samples=6079 num_times_within_2ms=5646 factor=92.877118
PIXEL_PER_MS=103
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
351.8ms ( 15)|
1MS num_time_samples=19475 num_times_within_1ms=15437 factor=79.265725
2MS num_time_samples=19475 num_times_within_2ms=19415 factor=99.691913
PIXEL_PER_MS=103
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
150.7ms ( 24)|
1MS num_time_samples=7052 num_times_within_1ms=6852 factor=97.163925
2MS num_time_samples=7052 num_times_within_2ms=7003 factor=99.305162
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 19 00:42 tmpfile
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
42.9ms (378)|
1MS num_time_samples=16697 num_times_within_1ms=16021 factor=95.951369
2MS num_time_samples=16697 num_times_within_2ms=16273 factor=97.460622
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 19 00:42 tmpfile
-rw-r--r-- 1 root root 350000000 Apr 19 00:43 tmpfile2
fragment latency = 1.451247 ms
cpu latency = 1.160998 ms
525.6ms (551)|
1MS num_time_samples=13764 num_times_within_1ms=12584 factor=91.426911
2MS num_time_samples=13764 num_times_within_2ms=12839 factor=93.279570
PIXEL_PER_MS=103
-rw-r--r-- 1 root root 350000000 Apr 19 00:42 tmpfile
-rw-r--r-- 1 root root 350000000 Apr 19 00:43 tmpfile2
40.610u 16.630s 3:28.57 27.4% 0+0k 0+0io 10796pf+0w

--
Dieter Nützel
Graduate Student, Computer Science

University of Hamburg
Department of Computer Science
@home: Dieter.Nuetzel@hamburg.de
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