Re: NTFS testing (was: [GIT PULL] vboxsf fixes for 5.14-1

[Eric Biggers]

On Fri, Sep 03, 2021 at 01:09:40AM +0300, Szabolcs Szakacsits wrote:
> User space drivers can have major disadvantages for certain workloads 
> however how relevant are those for NTFS users? Most people use NTFS for 
> file transfers in which case ntfs-3g read and write speed is about 15-20% 
> less compared to ext4. For example in some quick tests ext4 read was 
> 3.4 GB/s versus ntfs-3g 2.8 GB/s, and write was 1.3 GB/s versus 1.1 GB/s.

Your company's own advertising materials promoting your proprietary NTFS driver
(https://www.tuxera.com/products/tuxera-ntfs-embedded) claim that NTFS-3G is
much slower than ext4:

	Read:
		NTFS-3G: 63.4 MB/s
		ext4: 113.8 MB/s
		"Microsoft NTFS by Tuxera": 116 MB/s

	Write:
		NTFS-3G: 16.3 MB/s
		ext4: 92.4 MB/s
		"Microsoft NTFS by Tuxera": 113.3 MB/s

I'm not sure why anything you say should have any credibility when it
contradicts what your company says elsewhere, and your company has a vested
interest in not having proper NTFS support upstreamed to compete with their
proprietary driver.  (Note that Tuxera doesn't provide much support for NTFS-3G;
most of their efforts are focused on their proprietary driver.)

- Eric