From: Samium Gromoff <deepfire@ibe.miee.ru>
To: akpm@osdl.org, mbligh@aracnet.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Bug 890] New: performance regression compared to 2.4.20 under
Date: Thu, 10 Jul 2003 12:45:39 +0400 [thread overview]
Message-ID: <20030710124539.1d9dab9f.deepfire@ibe.miee.ru> (raw)
Andrew Morton <akpm@osdl.org> wrote:
> "Martin J. Bligh" <mbligh@aracnet.com> 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
reply other threads:[~2003-07-10 9:29 UTC|newest]
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