Re: arca-vm-26

Heinz Mauelshagen (mauelsha@ez-darmstadt.telekom.de)
Thu, 21 Jan 1999 2:17:28 MET

>
> On Wed, 20 Jan 1999, Andrea Arcangeli wrote:
>
> > I've put out an arca-vm-26. The differences between arca-vm-25 and -26 are
>
> I've released now arca-vm-27. I would like to know if you see
> some difference between arca-vm-26 and -27. The main difference is that I
> removed again the swapout smart code (that I inserted at PG_dirty time
> trying to decrease the stalls caused by the swap code that was running
> too much).
>

Sorry, it's not well performing.

mke2fs of a 12G device:
- buffermem is 200M of my 256M system afterwards
- minimum swap.
- lots of system time searching the buffer cache with
commands afterwards.
- commands running 50 to 100!!! times slower than before filling buffercache
- Bad interactive behaviour under X with jumping pointer and slow
character input when searching buffer cache

Once again: please think about the limitation of buffercache we had before
with /proc/sys/vm/buffermem!
If i hack an artivicial 10% limit for the buffercache, i
_don't_ get that bad performance.

Heinz

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Systemmanagement Entwicklungsbereich 2           Deutsche Telekom AG
                                                 Entwicklungszentrum Darmstadt
Heinz Mauelshagen                                Otto-Roehm-Strasse 71c
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mge@ez-darmstadt.telekom.de                      64205 Darmstadt
                                                 Germany
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