Re: slow down in 2.6 vs 2.4

[Clint Byrum]

On Tuesday, June 8, 2004, at 08:35 PM, Phy Prabab wrote:

> Hello!
>
> Over the last two days I have been struggling with
> understanding why 2.6.x kernel is slower than
> 2.4.21/23 kernels.  I think I have a test case which
> demostrates this issue.

Phy, you and I have corresponded off list. I think we are experiencing 
the same thing...

> 2.4.21:
> 323.68user 56.07system 6:35.77elapsed 95%CPU
> (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (3138783major+3818347minor)pagefaults
> 0swaps

Is there any way to get similar numbers system wide on 2.4? This exists 
for 2.6.x, and the latest sysstat shows it with sar -B, but as the sar 
manpage states, the fault/s numbers are not available on 2.4. :(

Stats for a recent period:

Linux 2.4.23 (xxx)       06/09/2004

11:40:00 AM  pgpgin/s pgpgout/s   fault/s  majflt/s
11:50:00 AM     17.52     72.34      0.00      0.00
12:00:00 PM     20.93     65.06      0.00      0.00
Average:        19.22     68.70      0.00      0.00

Linux 2.6.6 (yyy)        06/09/04

11:40:00     pgpgin/s pgpgout/s   fault/s  majflt/s
11:50:00        70.68     81.13  13756.37      0.02
12:00:00        89.22     81.82  11598.21      0.03
Average:        79.95     81.48  12676.43      0.03


Thats from two different boxes.. see my earlier message this week for 
an explanation of the setup.

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