Subject: Re: unified buffers and responsibility
To: Wojciech Puchar <wojtek@chylonia.3miasto.net>
From: Manuel Bouyer <bouyer@antioche.eu.org>
List: tech-kern
Date: 06/12/2002 22:03:19
On Wed, Jun 12, 2002 at 07:46:50PM +0000, Wojciech Puchar wrote:
> cp <500MB file> otherfile
>
> no delayed reactions in everything?
I didn't experience it. I tried with your settings, I also have 128M RAM.
However I did notice a strange thing:
for various reasons on both systems I tested,, the copy goes from/to
a different disk than the system disk. While I do the copy,
'systat vm' also shows some activity on the system disk, although
it's not swap:
14 users Load 4.45 3.52 2.47 Wed Jun 12 22:00:12
memory totals (in KB) PAGING SWAPPING Interrupts
real virtual free in out in out 530 total
Active 61216 74140 796 ops 100 irq0
All 123456 136380 134028 pages 5 irq1
irq4
Proc:r d s w Csw Trp Sys Int Sof Flt forks 178 irq9
3 15 513 529 405 559 249 401 fkppw 11 irq10
fksvm irq11
11.4% Sy 1.2% Us 0.0% Ni 1.8% In 85.6% Id pwait 180 irq12
| | | | | | | | | | | 38 relck 56 irq14
======% 38 rlkok irq15
noram
Namei Sys-cache Proc-cache 1 ndcpy
Calls hits % hits % fltcp
47 42 89 2 4 13 zfod
cow
Discs wd2 wd3 wd4 wd5 wd0 cd0 sd0 raid 64 fmin
seeks 85 ftarg
xfers 179 178 56 80 7677 itarg
Kbyte 3580 4014 688 5066 75 wired
%busy 85.6 97.6 36.8 100.0 pdfre
The cp goes from/to raid which is on wd2/wd4; wd0 is the system
disk. Are you doing the cp from/to the same disk as the system
disk ?
What could cause this activity on wd0 ?
--
Manuel Bouyer <bouyer@antioche.eu.org>
--