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

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Ubuntu | linux





------- Additional Comments From ubuntu at lwillis.plus.com  2005-12-12 15:12 UTC -------
(In reply to comment #48)
> If possible, please upgrade to Dapper's 2.6.15-7 kernel. If you do not want to
> upgrade to Dapper, then you can also wait for the Dapper Flight 2 CD's, which
> are due out within the next few days.

With 2.6.15-7 (I only updated the kernel and any dependencies that apt flagged -
I haven't upgraded my whole system to dapper) I get the following results [I've
included some from my "old" kernel [2.6.10] as well for comparison]:

Old kernel - Without GNOME

/dev/hda:
 Timing buffered disk reads:  130 MB in  3.03 seconds =  42.90 MB/sec
 Timing buffered disk reads:  130 MB in  3.01 seconds =  43.24 MB/sec
 Timing buffered disk reads:  128 MB in  3.04 seconds =  42.15 MB/sec



Old kernel - With Gnome

/dev/hda:
 Timing buffered disk reads:  102 MB in  3.02 seconds =  33.77 MB/sec
 Timing buffered disk reads:   96 MB in  3.06 seconds =  31.34 MB/sec
 Timing buffered disk reads:  100 MB in  3.02 seconds =  33.06 MB/sec



New kernel - With Gnome

/dev/hda:
 Timing buffered disk reads:  118 MB in  3.00 seconds =  39.28 MB/sec
 Timing buffered disk reads:  134 MB in  3.03 seconds =  44.25 MB/sec
 Timing buffered disk reads:  120 MB in  3.01 seconds =  39.89 MB/sec



New kernel - Without Gnome

/dev/hda:
 Timing buffered disk reads:  134 MB in  3.04 seconds =  44.08 MB/sec
 Timing buffered disk reads:  138 MB in  3.02 seconds =  45.75 MB/sec
 Timing buffered disk reads:  138 MB in  3.02 seconds =  45.75 MB/sec


As you can hopefully see - the new kernel appears to have improved performance
from around 32MB/s to around 41MB/s. This matches what I was originally seeing
on hoary so I'd hesitate to say this is fixed with the latest kernel. I'd note
though that disk performance while in GNOME is still about 4MB/s slower than
without GNOME running (41MB/s vs. 45.1 MB/s). Not sure if that's worth
discussing separately. Any clue as to what was causing the degradation?

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