Re: Help understanding slow down

[Phy Prabab]

Okay, so ran the test with vmstat running.  I ran it
capturing every 1 sec.  Here is an excert:

procs                      memory      swap         
io     system         cpu
 r  b   swpd   free   buff  cache   si   so    bi   
bo   in    cs us sy id wa
 1  0      0 8153848  17000  82348    0    0     0    
0 4568  4028  6 16 78  0
 0  1      0 8154168  17008  82340    0    0     0  
160 4596  4079  7 17 76  1
 1  0      0 8153848  17008  82340    0    0     0    
0 4511  3998  7 16 76  0
 1  0      0 8153912  17008  82340    0    0     0    
0 4460  3952  7 14 79  0
 1  0      0 8153784  17016  82332    0    0     0    
0 4437  3962  7 16 77  0
 1  0      0 8153528  17016  82332    0    0     0    
0 4444  3927  7 14 78  0
 1  1      0 8153784  17024  82392    0    0     0  
144 4399  3895  7 15 77  1
 0  0      0 8153592  17024  82392    0    0     0    
0 4367  3821  7 15 78  0
 1  0      0 8153848  17024  82392    0    0     0    
0 4393  3926  6 16 78  0
 1  0      0 8153528  17024  82460    0    0     0    
0 4438  3960  8 14 78  0
 1  0      0 8154040  17024  82460    0    0     0    
0 4415  3912  6 15 78  0
 1  1      0 8153720  17032  82452    0    0     0  
140 4457  3953  7 15 77  1
 1  0      0 8153784  17032  82452    0    0     0    
0 4437  3889  7 14 79  0
 0  0      0 8153784  17040  82444    0    0     0    
0 4398  3903  8 15 77  0
 1  0      0 8153464  17040  82444    0    0     0    
0 4398  3902  7 14 79  0
 0  0      0 8153528  17040  82444    0    0     0    
0 4447  3922  6 17 77  0
 0  1      0 8153720  17052  82432    0    0     0  
144 4490  3960  6 16 77  1
 0  0      0 8153656  17056  82428    0    0     0    
0 4449  3954  7 15 78  0


--- William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:
> On Mon, May 24, 2004 at 03:25:53AM +0200, Jakob
> Oestergaard wrote:
> > Eh, not if I read the numbers right:
> > 2.6.7-p1: 24.86user 51.77system 2:58.87elapsed
> 42%CPU
> > 24.86 + 51.77 = 76.63 seconds on CPU, 102.24
> seconds of waiting
> > 2.4.21: 28.68user 34.98system 1:12.34elapsed
> 87%CPU
> > 28.68 + 34.98 = 63.66 seconds on CPU, 8.68 seconds
> of waiting
> > So, 2.6.7-p1 spends 16.79 seconds more in the
> kernel as you observed,
> > but it spends 93.56 seconds more waiting for I/O
> (or whatever).
> > Unless I'm totally missing something, the wait
> seems to be the
> > regression.
> 
> I'm sorry, you're right. Let's start by looking into
> IO activity.
> Phy, could you log the output of vmstat(1) during
> the runs?
> 
> 
> -- wli
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