Re: Poor performance with 2.5.52, load and process in D state

From: Paolo Ciarrocchi (ciarrocchi@linuxmail.org)
Date: Wed Dec 25 2002 - 19:03:08 EST

Hi Andrew/Rik/Con/all

Andrew, I promised you to run a few tests
using osdb (www.osdb.org with 40M of data)against both
2.4.19 and 2.5.52 booting the kernel with the
mem=XXM paramter.

I also played with the /proc/sys/vm/swappiness
parameter, I've ran all the tests with the standard
swappiness value (60), with 80 and 100.

100 means the 2.4 behaviour, isn't it ?

Looking at the results it seems that the "standard"
value is too low, probably 80 is the best one.
What do you think ?

There is no a big difference in the Time results
between 80 and 100 but looking at the top output
while I was running the tests I saw a big difference
in the swap usage.

Con, could you please run the contest test against
2.5.52 or .53 platying with the swappines parameter ?

Below the results of my test, please let me know if
you want I run more tests or if you need more information.

Ciao,
            Paolo
            
-- By Memory Size --
Kernel Memory Swappiness Time
2.4.19 24 x 3371.98 seconds (0:56:11.98)
2.5.52 24 60 4585.03 seconds (1:16:25.03)
2.5.52 24 80 4285.98 seconds (1:11:25.98)
2.5.52 24 100 3633.64 seconds (1:00:33.64)

2.4.19 40 x 809.39 seconds (0:13:29.39)
2.5.52 40 60 3771.85 seconds (1:02:51.85)
2.5.52 40 80 3342.82 seconds (0:55:42.82)
2.5.52 40 100 855.22 seconds (0:14:15.22)

2.4.19 64 x 796.03 seconds (0:13:16.03)
2.5.52 64 60 840.41 seconds (0:14:00.41)
2.5.52 64 80 828.59 seconds (0:13:48.59)
2.5.52 64 100 833.92 seconds (0:13:53.92)

2.4.19 80 x 790.80 seconds (0:13:10.80)
2.5.52 80 60 788.65 seconds (0:13:08.65)
2.5.52 80 80 790.54 seconds (0:13:10.54)
2.5.52 80 100 793.79 seconds (0:13:13.79)

2.5.52 96 60 779.54 seconds (0:12:59.54)
2.5.52 96 80 782.86 seconds (0:13:02.86)
2.5.52 96 100 778.81 seconds (0:12:58.81)

2.4.19 all x 778.65 seconds (0:12:58.65)
2.5.52 all 60 768.98 seconds (0:12:48.98)
2.5.52 all 80 770.43 seconds (0:12:50.43)
2.5.52 all 100 771.76 seconds (0:12:51.76)

-- By kernel version --
2.4.19 24 x 3371.98 seconds (0:56:11.98)
2.4.19 40 x 809.39 seconds (0:13:29.39)
2.4.19 64 x 796.03 seconds (0:13:16.03)
2.4.19 80 x 790.80 seconds (0:13:10.80)
2.4.19 all x 778.65 seconds (0:12:58.65)

2.5.52 24 60 4585.03 seconds (1:16:25.03)
2.5.52 40 60 3771.85 seconds (1:02:51.85)
2.5.52 64 60 840.41 seconds (0:14:00.41)
2.5.52 80 60 788.65 seconds (0:13:08.65)
2.5.52 96 60 779.54 seconds (0:12:59.54)
2.5.52 all 60 768.98 seconds (0:12:48.98)

2.5.52 24 80 4285.98 seconds (1:11:25.98)
2.5.52 40 80 3342.82 seconds (0:55:42.82)
2.5.52 64 80 828.59 seconds (0:13:48.59)
2.5.52 80 80 790.54 seconds (0:13:10.54)
2.5.52 96 80 782.86 seconds (0:13:02.86)
2.5.52 all 80 770.43 seconds (0:12:50.43)

2.5.52 24 100 3633.64 seconds (1:00:33.64)
2.5.52 40 100 855.22 seconds (0:14:15.22)
2.5.52 64 100 833.92 seconds (0:13:53.92)
2.5.52 80 100 793.79 seconds (0:13:13.79)
2.5.52 96 100 778.81 seconds (0:12:58.81)
2.5.52 all 100 771.76 seconds (0:12:51.76) 

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This archive was generated by hypermail 2b29 : Tue Dec 31 2002 - 22:00:08 EST