Re: Horrible ftruncate performance

[Szakacsits Szabolcs <szaka@sienet.hu>]

On Thu, 10 Jul 2003, Oleg Drokin wrote:
>
> angband:/mnt # time dd if=/dev/zero of=sparse bs=1 seek=200G count=1
> 1+0 records in
> 1+0 records out
>
> real    0m19.205s
> user    0m0.000s
> sys     0m7.130s

Interesting. For me, the real and the system time was always [almost] the
same.

> This is on Athlon MP-1700+ (I have dual system). The system is all IDE.
> This is still kind of long, but it is better than it was ;)
> Actually I expected it to be much faster, I guess I need to take a look why
> it still eats this much time.
>
> > > (on 4k blocksize)
> > AFAIK, reiserfs supports only 4 kB blocksizes. At least the
> > 'man mkreiserfs' said always so.
>
> may be you just have old reiserfsprogs version.

Yes, I have whatever the latest distros ship. Right now I could check out
only Red Hat 9 and SuSE 8.2, they both have 3.6.4. The latest reiserfsprogs
is 3.6.8.

> There are support for variable blocksizes in 2.5, and there is separate
> patch for 2.4

Cool. The max 4 kB block size was a long time common deficiency of the main
Linux filesystems.

Cheers,

	Szaka