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: gnome-vfs2-2.16.2-1.fc6 How reproducible: Always 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 server..." dialog 3. Copy a large file from the share to the local system. Actual results: 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 process. Expected results: 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 _dbus_real_assert.
*** 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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