[linux-mm-cc] fillmem performance result in a limited memory x86 desktop

Nai Xia nai.xia at gmail.com
Sun Apr 13 05:47:33 EDT 2008


Hi, all

I've done some testing using fillmem in a limited memory x86 desktop.
Testing environment:
OS: debian sid (updated today) + kernel 2.6.24.4
CPU: Pentium(R) 4 CPU 2.00GHz,
Memory:  119M ram,  5026M swap partition
DISK:
       model: WDC WD800BB-00JHC0,
       raw swap performance: (hdparm -tT /dev/hda3)
               Timing cached reads:   287.43 MB/sec
               Timing buffered disk reads:  36.35 MB/sec


Test Result:

fillmem(M)	unused		used
80		0m0.570s	0m0.413s
100		0m0.535s	0m0.502s
120		0m5.492s	0m3.084s
140		0m7.671s	0m6.689s
160		0m11.050s	0m8.036s
180		0m14.849s	0m10.304s
200		0m16.968s	0m13.803s
220		0m22.178s	0m18.948s
240		0m26.036s	0m23.735s
260		0m27.664s	0m26.053s
280		0m34.054s	0m29.959s
300		0m36.213s	0m31.993s

It's worth to note that I observed the deviation of the numbers is
somewhat high (up to 30%~40%). Any idea to reduce it?
Or we may just ignore it ?

Best Regards,
Nai


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