Re: file write performance drop between 2.5.60 and 2.5.70

[Andrew Morton]

Vladimir Saveliev <[e-mail]> wrote:
>
> Hi
> 
> It looks like file write performance dropped somewhere between 2.5.60 and 
> 2.5.70.
> Doing
> time dd if=/dev/zero of=file bs=4096 count=60000
> 
> on a box with Xeon(TM) CPU 2.40GHz and 1gb of RAM
> I get for ext2
> 2.5.60: 	real	1.42 sys 0.77
> 2.5.70: 	real 1.73 sys 1.23
> for reiserfs
> 2.5.60: 	real 1.62 sys 1.56
> 2.5.70: 	real 1.90 sys 1.86
> 
> Any ideas of what could cause this drop?
> 

hm, 2.5.60 was a long time ago.  The best way to tell would be comparative
oprofiling.