Red Hat Bugzilla – Bug 215890
High CPU load by gnome-vfs-daemon [dbus validation slow]
Last modified: 2013-03-05 22:48:00 EST
Description of problem:
High CPU utilization (+80%) is perceived when transferring data over SMB by the
gnome-vfs-daemon, also (maybe as a consequence of this condition) the transfer
rate is very low (~10mbit/sec over a 100mbit/sec connection) other protocols,
such as sftp or simple ftp transfer much faster, but they are still limited when
used through gnome-vfs (e.g, from within Nautilus), however these protocols are
considerably faster than SMB (~50mbit/sec) when using gnome-vfs, and these same
protocols go full speed when using either samba-client, ftp or sftp from the
command line or with programs such as gFTP (though gFTP does not support SMB).
The high CPU utilization is confirmed by programs such as gnome-system-monitor,
top, ps and gkrellm, the identification of the program responsible of this is
easily viewed with top, ps or gnome-system-monitor. These conditions were
observed when moving rather large chunks of data over the SMB line (~300Mb), it
does not matter the actual number of files (one time it was a large monolithic
archive, another several smaller package files)
Version-Release number of selected component (if applicable):
gnome-vfs-daemon, part of the package:
Steps to Reproduce:
1. Update gome-vfs2 to the latest version
2. Open an SMB share through smb:// in Nautilus or through the "Connect to
3. Copy a large file from the share to the local system.
The gnome-vfs-daemon program eats up a lot CPU cycles when transfering large
chunks of data over an SMB connection, maybe affecting the transfer rate in the
For the program to use less resources and faster transfer rates.
I ran this in sysprof, and it seems the validation of messages is really slow.
The profile shows 70% of system cpu time spend reading the dbus messages.
Created attachment 141647 [details]
profile for smb copy
This is a (large) sysprof profile for copying a large file. About 65% of the
system time is spent in _dbus_validate_body_with_reason. Although, as you can
see a large part of that (27% total system time) is actually ending up in
*** Bug 212379 has been marked as a duplicate of this bug. ***
I tried the dbus-1.0.0-2.fc6 build which has asserts and stuff disabled, and it
seems a lot better.
Are we gonna release that as an update?
When i say better i mean the total cpu use is lower, and the copy is faster.
However, dbus_validate_body_with_reason still takes 45% of the system time
(although the used system time is less than before). I.E. There are still
opportunities for optimization here.
Alex, thanks for the confirmation. I wouldn't know how to run a profile to try
and identify all the processes in volved. So this is a mixed situation? Part
D-Bus and part gnome-vfs?
No, its a dbus performance issue only.
*** Bug 216478 has been marked as a duplicate of this bug. ***
*** Bug 187592 has been marked as a duplicate of this bug. ***
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