Hi,

From the charts your provided in http://www.tuxera.com/products/tuxera-n ... rformance/, you can easily have ntfs-3g(opensource) get about 40Mbps write thruput even on the embedded system(MIPS 24K, 333 MHz CPU, 96 MB RAM, Samsung HD103SI 1 TB USB2.0 interface), but when I try to port the latest ntfs-3g to my platform(MIPS,4K, 400MHz,64MB RAM, linux kernel 2.6.21,USB2.0), I only reach about 20Mbps write thruput, could you give me some hints how to improve the write performance when porting it?
Thanks in advance!

Hebert

Hi,


The mentionned charts only claim read at 20Mbps and write at 10Mbps for ntfs-3g opensource, so your port is better.

What do you mean by "port the latest ntfs-3g to my platform" ? What kind of adaptations did you do ?
The same charts show Tuxera ntfs (closed source) has better performance, so that is the best hint.
Depending on your usage pattern, you may get better performances from the latest advanced ntfs-3g, but if the throughput is limited by the architecture (ntfs-3g is not a kernel driver), you may not see the improvement.

Regards

Jean-Pierre

Hi,

If we want to purchase your commercial solution, How many write thruput may it can reach?
Our platform: MIPS 400MHz, 64KB Cache, 64MB RAM, USB 2.0 interface; Linux 2.6.21

Thanks.

Hebert

Write performance can be over 100 MB/s using eSATA or USB 3.0 with the commercial Tuxera NTFS. Performance is limited to maximum about 30 MB/s with the USB 2.0 protocol due to the USB 2.0 protocol design. If you want more speed then you need eSATA or USB 3.0.

Hi

I am using NTFS-3G on a plug computer (Sheeva Plug with 1.2 Ghz ARM, Ubuntu 9.08)
The write performance I currently get is around 8Mb/s, CPU load that is used when writing is about 80%, the remaining 20% is network and system.

I compiled the latest version of NTFS-3G so problems related to older verions can be excluded.

Is there any problem with the driver using so much CPU?

Thanks Michael

Hi,


Which one ?

This can be normal under some circumstances : writing compressed files, big files on a very fragmented partition, big partition over 75% full, etc.

There should be some improvement with the latest advanced version (release candidate, see http://www.tuxera.com/community/ntfs-3g-advanced/ )

If you can make a metadata image available on a public server (use ntfsclone and gzip the result), I can tell you the likely cause in your situation.

Regards

Jean-Pierre

Hi there

Thanks for your reply.
The version i comiled was STABLE Version 2010.1.16 (January 16, 2010).

I am using a new drive which is only 10% full.
I checked in the FAQ and none of the points mentioned there seem to apply for my situation. (fragmented drive, large files.....)

Reading is very fast and uses hardly any resources at all.

I will further investigate and post an image, need to figure out how first .

I might also try the advanced version.

I will report back.

Michael

It's this one:

NTFS-3G is a user space driver and it has a big CPU overhead on the very slow embedded devices. Tuxera NTFS, which is a kernel driver, is often 10 times faster and has less CPU use. But unfortunately that's not free.

OK.... thanks....
I assume I cannot buy this product for the Sheeva Plug?

Best regards

Michael

Sadly not. We need the kernel and development files from the vendor to build and make the driver safe.