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[Martin Weis <martin.weis.newsadress@xxxxxx>]

This affects me without using a virtual machine. 
There are other bugs about excessive CPU usage,. which might be related:
#369194
#1404765

Similar other bugs were filed against other protocol types (dav, http, ssh, sftp, fuse), so these issues might be related, e.g.
#1401351
#1174663
#1404765
#1059332
#880637

How to debug this?

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https://bugs.launchpad.net/bugs/1409032

Title:
  gvfsd-smb: very high CPU utilisation

Status in gvfs package in Ubuntu:
  Confirmed

Bug description:
  Example:

  I use Virtualbox and mount a .vdi on an SMB server. Using gvfsd-smb
  (browsing within Gnome to find the share), gvfsd-smb uses up to 50%
  CPU which slows down the entire system when accessing the network
  share. Mounting using sudo ($ sudo mount -t smbfs -o
  guest,nounix,noperm //server/share /media/share) so that cifs is used
  uses around 8% CPU. The difference is dramatic!

  If I didn't have sudo access my machine would grind to a halt when
  trying to use the remote share.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gvfs-backends 1.12.1-0ubuntu1.2
  ProcVersionSignature: Ubuntu 3.11.0-26.45~precise1-generic 3.11.10.12
  Uname: Linux 3.11.0-26-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: i386
  Date: Fri Jan  9 14:32:20 2015
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: gvfs
  UpgradeStatus: Upgraded to precise on 2014-12-07 (33 days ago)

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