Very slow write performance on shared folders when file pointer is often repositioned

[maddes_b]

Guest: Windows XP 32-Bit, 1024MB
Host: Windows 7 64-Bit, 4096MB

While testing ​Regshot I recognized that write performance onto a shared folder is 3-5x slower than on the host. Writing onto a virtual disk is as fast as on the host.

To reproduce run Regshot 1.9.0, click "1st Shot", select "Shot and Save..." and save to the virtual disk.
Then click "2nd Shot", select "Shot and Save..." and save to a shared folder.
You will recognize the difference.

If you are interested in the executed ​code look at ​regshot.c (function SaveRegKeys) and ​fileshot.c (function SaveFiles).

Kind regards
Maddes

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.