VirtualBox

Ticket #11477 (new defect)

Opened 14 months ago

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

Reported by: maddes_b Owned by:
Priority: major Component: shared folders
Version: VirtualBox 4.2.6 Keywords: performance write seek
Cc: Guest type: Windows
Host type: Windows

Description

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

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