Re: [PATCH] VM fixes + RSS limits 2.4.0-test13-pre5 / test13-pre7

From: Dieter Nützel (Dieter.Nuetzel@hamburg.de)
Date: Sat Dec 30 2000 - 21:30:39 EST

Hello Rik,

I did some more benchmarks on this --- puh, took me some time...:-)

Test machine: 256 MB, K7 550 SlotA, SCSI, IDE, ReiserFS 3.6.23, Blocksize=4K
Test: dbench 48

2.4.0-test13-pre5 + Rik's VM fix #2

/dev/sda7:
 Timing buffered disk reads: 64 MB in 6.07 seconds = 10.54 MB/sec

Throughput 7.54785 MB/sec (NB=9.43482 MB/sec 75.4785 MBit/sec)
41.200u 95.870s 13:59.50 16.3% 0+0k 0+0io 1797pf+0w

-O -mcpu=k6 -mpreferred-stack-boundary=2 -malign-functions=4
-fschedule-insns2 -fexpensive-optimizations

Throughput 7.7981 MB/sec (NB=9.74762 MB/sec 77.981 MBit/sec)
42.180u 96.620s 13:32.54 17.0% 0+0k 0+0io 1799pf+0w

--------------------------------------------------

/dev/hdc1:
 Timing buffered disk reads: 64 MB in 2.89 seconds = 22.15 MB/sec

Throughput 9.4113 MB/sec (NB=11.7641 MB/sec 94.113 MBit/sec)
36.990u 117.720s 11:13.24 22.9% 0+0k 0+0io 1505pf+0w

-O -mcpu=k6 -mpreferred-stack-boundary=2 -malign-functions=4
-fschedule-insns2 -fexpensive-optimizations

Throughput 10.254 MB/sec (NB=12.8175 MB/sec 102.54 MBit/sec)
36.620u 112.870s 10:17.91 24.1% 0+0k 0+0io 1505pf+0w

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

2.4.0-test13-pre7

/dev/sda7:
 Timing buffered disk reads: 64 MB in 6.07 seconds = 10.54 MB/sec

Throughput 9.61382 MB/sec (NB=12.0173 MB/sec 96.1382 MBit/sec)
43.950u 96.790s 10:59.06 21.3% 0+0k 0+0io 1746pf+0w

-O -mcpu=k6 -mpreferred-stack-boundary=2 -malign-functions=4
-fschedule-insns2 -fexpensive-optimizations

Throughput 10.8312 MB/sec (NB=13.539 MB/sec 108.312 MBit/sec)
44.510u 93.000s 9:44.99 23.5% 0+0k 0+0io 1795pf+0w

-------------------------------------------------

/dev/hdc1:
 Timing buffered disk reads: 64 MB in 2.89 seconds = 22.15 MB/sec

Throughput 12.3312 MB/sec (NB=15.414 MB/sec 123.312 MBit/sec)
35.220u 112.630s 8:33.83 28.7% 0+0k 0+0io 1505pf+0w

-O -mcpu=k6 -mpreferred-stack-boundary=2 -malign-functions=4
-fschedule-insns2 -fexpensive-optimizations

Throughput 14.4331 MB/sec (NB=18.0414 MB/sec 144.331 MBit/sec)
36.060u 119.760s 7:19.00 35.4% 0+0k 0+0io 1505pf+0w

Addition:
Your fix show some 'bad' swap behavior on my 'normal' load (3D medical
visualization). It do some 'little' swap out and in. Mostly the (not needed?)
swap in hurts performance. A little 'cp -a X11R6 X11R6-new' take more than 2
times longer. If my system hits the 'ZERO swap wall' the currently running
process (render) abort immediately and restart. With test13-pre7 it runs
several times longer (render generates some more frames) but then load goes
up to 10 and render would be killed.

SunWave1>cat /proc/version
Linux version 2.4.0-test13-pre7 (root@SunWave1) (gcc version 2.95.2 19991024
(release)) #1 Sat Dec 30 22:13:04 CET 2000
SunWave1>free -t
             total used free shared buffers cached
Mem: 255728 164980 90748 0 34160 46488
-/+ buffers/cache: 84332 171396
Swap: 200772 8 200764
Total: 456500 164988 291512

Happy New Year!
I'll be back on Monday.

-Dieter 

-- 
Dieter Nützel
Graduate Student, Computer Science

University of Hamburg
Department of Computer Science
Cognitive Systems Group
Vogt-Kölln-Straße 30
D-22527 Hamburg, Germany

email: nuetzel@kogs.informatik.uni-hamburg.de
@home: Dieter.Nuetzel@hamburg.de
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