[Bug 15571] Reduced I/O performance when logged into GNOME

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Ubuntu | UNKNOWN





------- Additional Comments From ubuntu at lwillis.plus.com  2005-10-10 12:48 UTC -------
(In reply to comment #43)
> Booting the hoary kernel in a breezy userspace is what we would like you to do.
> 
> Also, if you can try to track down which component of the gnome login which
causes the slowdown, that'd be very useful.

Right - I tried 2.6.10-5-386 from hoary and here are the results (Figures are
buffered disk reads from hdparm -t):

2.6.10-5-386 (No GNOME session running)	
Run #1	46.0
Run #2	46.0
Run #3	43.0
Average	45.0
	
2.6.10-5-386 (With GNOME session)	
Run #1	43.0
Run #2	42.0
Run #3	39.0
Average	41.3

As you can see no obvious slowdowns. Rebooting to the latest breezy kernel gives
the following results:
	
2.6.12-9-386 (No GNOME session running)	
Run #1	41.2
Run #2	45.6
Run #3	45.6
Average	44.1

2.6.12-9-386 (With GNOME session)	
Run #1	21.5
Run #2	23.5
Run #3	24.8
Average	23.2

Very noticeable slowdown.

Re: "Working out which GNOME component is causing the problem". I have tried a
number of things but can't nail down the problem. My speeds now (Circa 23MB/s)
are better than they were with the benefit mainly coming from  killing off
various applets on my panel seems to have helped. My suspicion is that some
low-level library is having the issue rather than a particular app since I seem
to get a small incremental improvement the more apps that I kill off, but no big
obvious win ...

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