Hi!
I have done some measurements.
On the Linux host:
$ cat inf.sh
#! /bin/bash --
echo "HTTP/1.0 200 OK
Content-type: application/infinite
"
exec cat /dev/zero
$ chmod +x ./inf.sh
$ nc -l -p 6543 -e ./inf.sh
On the Windows guest:
cmd
C:\> wget -O nul http://linuxhost:6543/
Letting it run for a few minutes wget reports about 7.20 MB/s average.
So 7.20 MB/s seems to be an upper bound on the speed of the TCP
connections I can get between my Linux host and VirtualBox guest.
(This speed won't be enough for my needs.)
If I run a similar wget command on the host:
$ wget -O /dev/null http://127.0.0.1:6543/
wget reports about 300 MB/s. I won't expect VirtualBox to be this fast,
but having about 20 MB/s with VirtualBox would be quite fine for me.
I have also found a bug: when I restart VirtualBox and resume my Windows
XP guest, the sharedfolder connection to \\vboxsvr just vanishes with a
timeout. I have to reboot my Windows XP guest to see the shared folder
again.
I have tried how fast I can copy files from my Linux host to the Windows
XP guest. I use FAR Manager, mount \\vboxsvr\sharename, and copy a file
(with F5) to nul. It is quite impressive: 30 MB/s! The maximum
sequential read speed of my hard drive is 70 MB/s (when copying with
Midnight Commander to /dev/null on the Linux host).
But, unfortunately, the VirtualBox sharedfolders isn't stable enough. For
example, FAR Manager just stops responding after a few dozen seconds. In
other occasions, the whole Windows XP crashes with a blue screen of death.
As a summary:
-- Copying from the Linux host to the Windows XP guest is quite fast (30
MB/s) but unstable thus it is not usable for real work.
-- After a virtual message save + restore, sharedfolders ceases to work.
-- Data transfer from the Linux host to the Windows XP guest using TCP/IP
(and Samba) is too slow, because TCP/IP communication speed cannot go
above 7.20 MB/s (what I've measured).
What I would need is a stable sharedfolders, or, as a fallback, a
considerably faster TCP/IP (20 MB/s minimum).
Please let me know if I can further help you diagnosing the problem.
Best regards,
Péter Szabó
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