Hi there!

I'm using the latest (2009.2.1) version of NTFS-3G under Ubuntu 8.04.
When I'm writing to my NTFS partition I can only reach 10MB/s and my CPU is on 50%.
I can see clearly that the mount.ntfs-3g process is using 100% of the CPU but only one core!

How can I set to use both cores? Is there any option when I ./configure NTFS-3g?

thanks in advance

Hi,


Currently you cannot. ntfs-3g serializes the requests, and redesigning the code to make it multithreaded with proper synchronization is not on the agenda (at least not on my own !).


This is an unusual CPU to throughput ratio. Are you doing something special (big sparse files ?)

Regards

Jean-Pierre

Thanks for the reply. I was afraid of that NTFS-3G is not supporting more than one threads, at least now I know it :)

I'm not doing anything special, just copying single files (around 10GB each) to my WD10EACS (1TB) drive. The read performance is much better, 30-40MB/s.

The drive is not fragmented.

I've underclocked my CPU (because I wanted to use passive cooling).
AMD 5050e CPU which should go at 2.6GHz (45W TDP), is now at 1.4GHz so that can be the reason why It's this slow. :)

> Thanks for the reply. I was afraid of that NTFS-3G is not supporting
> more than one threads, at least now I know it :)

It wouldn't help because the relevant code (like most others) is not
parallelizable.

> I'm not doing anything special, just copying single files (around 10GB
> each) to my WD10EACS (1TB) drive. The read performance is much better,
> 30-40MB/s.

Large block size support will significantly improve your case and better
fragmented file support too. The Advanced NTFS-3G already has the later.

> I've underclocked my CPU (because I wanted to use passive cooling).
> AMD 5050e CPU which should go at 2.6GHz (45W TDP), is now at 1.4GHz so
> that can be the reason why It's this slow. :)

That's definitely a reason.