Re: [Bug 890] New: performance regression compared to 2.4.20 under

[Samium Gromoff]

Andrew Morton <[e-mail]> wrote:
> "Martin J. Bligh" <[e-mail]> wrote:
> >
> > As can be seen, the differences are quite significant, about three seconds on
> > average, which I believe may be related to the increased swapping time I have
> > encountered.
>
> The 2.4 VM's virtual scan has the effect of swapping out one process at a
> time.  2.5's physical(ish) scan doesn't have that side-effect.
>
> It means that in 2.4, the lucky processes can make decent progress.  In
> 2.5, everyone makes equal progress and everyone thrashes everyone else to
> bits.

	I have precisely the same problem on my p166-16M RAM.
	Disk/controller are fast, and dma is on.

	2.4 runs much much faster. Remote shell logins are more than twice as fast.

	Needless to say it runs 2.4 ;-)

-- 
Cheers, Samium Gromoff

regards, Samium Gromoff