2.6.21 -> 2.6.22 & 2.6.23-rc8 performance regression

["Denys" <nuclearcat@nuclearcat.com>]

P.S. It seems SLAB/SLUB doesn't make much difference, just seems SLUB use a 
bit more some resources.
Still problem appearing with softirqd/0 or softirqd/1 taking a lot CPU (while 
on 2.6.21 it never came up of the "top"), and doesn't matter - if NAPI on 
e1000 disabled or enabled. Additionally disabling all disk operations doesn't 
make any difference.

defaulthost ~ #mpstat 1
Linux 2.6.23-rc8-build-0017 (defaulthost)       09/30/07

21:20:29     CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal
   %idle    intr/s
21:20:30     all   21.11    0.00   14.57    8.04    0.00   48.74    0.00    
7.54   3632.00
21:20:31     all   23.38    0.00   12.94   10.95    0.00   52.74    0.00    
0.00   1524.00
21:20:32     all   21.50    0.00   16.50    8.50    0.00   53.50    0.00    
0.00   1473.00
21:20:33     all   22.39    0.00   14.93    4.98    0.50   53.23    0.00    
3.98   1492.08
21:20:34     all    5.31    0.00    0.97    0.48    0.00   93.24    0.00    
0.00   1351.96

On 2.6.21 it looks:

defaulthost ~ #mpstat 1
Linux 2.6.21-gentoo-r3-build-0015 (defaulthost)         09/30/07

18:21:50     CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal
   %idle    intr/s
18:21:51     all   29.50    0.00   21.50   12.50    0.00    6.00    0.00   
30.50   8416.00
18:21:52     all   26.00    0.00   19.00   12.50    0.50    7.00    0.00   
35.00   8663.64
18:21:53     all   27.23    0.00   17.82   13.37    0.99    6.44    0.00   
34.16   7828.71
18:21:54     all   26.13    0.00   16.08   18.59    0.00    7.04    0.00   
32.16   8657.58
18:21:55     all   22.89    0.00   16.92   18.91    0.50    6.47    0.00   
34.33   7957.43
18:21:56     all   28.14    0.00   21.61   17.59    0.50    6.03    0.00   
26.13   8531.00



--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.

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