Re: large files

[Bernd Schubert <bernd-schubert@web.de>]

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> > 1.) During the filecreation in 2.4.26 the load on the system was around
> > 3-4, whereas in 2.6.6-mm3 the load was at about 8-9.
>
> Which procs contributed to this load?  The simple dd should have kept
> the load at one.

Thats all I can see from top (2.4.26):

top - 16:45:14 up  4:47,  1 user,  load average: 3.30, 2.80, 2.09
Tasks:  80 total,   1 running,  79 sleeping,   0 stopped,   0 zombie
Cpu(s):   0.0% user,  24.0% system,   0.0% nice,  76.0% idle
Mem:   3104428k total,  3018816k used,    85612k free,   228936k buffers
Swap:  1951888k total,        0k used,  1951888k free,  2662272k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                           
1043 root      19   0  1392  364  320 D 40.7  0.0   3:11.55 dd                                                   
7 root       9   0     0    0    0 D  3.7  0.0   4:02.48 kupdated                                             
6 root       9   0     0    0    0 D  1.7  0.0   2:15.18 bdflush                                              
5 root       9   0     0    0    0 S  1.0  0.0   2:47.13 kswapd                                              
17 root       9   0     0    0    0 D  0.3  0.0   0:46.62 kreiserfsd                                        
1052 root       9   0  1040 1040  820 R  0.3  0.0   0:00.02 top                                              


taylor:~# cat /proc/stat 
cpu  402 0 538233 2938065
cpu0 221 0 267698 1470431
cpu1 181 0 270535 1467634
page 215506778 453499588
swap 1 0
intr 200179775 1738350 2 0 9 4 0 2 0 4 2 0 0 0 0 13 5 0 0 0 0 0 0 0 0 5017728 
187006 0 0 0 193236650 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0
disk_io: (3,0):(4,4,32,0,0) (8,0):
(5058268,3638518,431013524,1419750,906999184) 
ctxt 179608469
btime 1084874257
processes 1054


Unfortunality I even don't have an idea how to interprete those numbers.


> > Do you have any ideas how we could improve 2.4.x?
>
> 2.6.6-mm has a few key improvements.  There's less metadata
> fragmentation thanks to some block allocator fixes.  More importantly,
> during the rm, metadata blocks are read in 16 at a time instead of 1 at
> a time.  I'd be happy to give someone pointers on porting the metadata
> readahead bits back to 2.4.

I certainly have neither the knowledge nor the time to do that.


Cheers,
	Bernd

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