From: Rik van Riel <H.H.vanRiel@phys.uu.nl>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: Neil Conway <nconway.list@ukaea.org.uk>,
Linux MM <linux-mm@kvack.org>,
Jean-Michel.Vansteene@bull.net,
"linux-kernel@vger.rutgers.edu" <linux-kernel@vger.rutgers.edu>
Subject: Re: SWAP: Linux far behind Solaris or I missed something (fwd)
Date: Fri, 4 Dec 1998 16:23:44 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.3.96.981204162132.21578A-100000@mirkwood.dummy.home> (raw)
In-Reply-To: <199812041449.OAA04573@dax.scot.redhat.com>
On Fri, 4 Dec 1998, Stephen C. Tweedie wrote:
> On Fri, 4 Dec 1998 10:41:15 +0000, Neil Conway
> <nconway.list@ukaea.org.uk> said:
>
> >> (although the 2.1.130+my patch seems to work very well
> >> with extremely high swap throughput)
>
> > Since the poster didn't say otherwise, perhaps this test was performed
> > with buffermem/pagecache.min_percent set to their default values, which
> > IIRC add up to 13% of physical RAM (in fact that's PHYSICAL ram, not 13%
>
> I know. That's why relying on fixed margins to ensure good
> performance is wrong: the system really ought to be self-tuning.
> We may yet get it right for 2.2: there are people working on this.
It appears that 2.1.130 + my little patches only needs the
borrow percentage (otherwise kswapd doesn't have enough
reason to switch from the always-succesful swap_out()),
and that only needs to be set to a high value...
(ie. /not/ the braindead values that went into 2.1.131)
cheers,
Rik -- the flu hits, the flu hits, the flu hits -- MORE
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next prev parent reply other threads:[~1998-12-04 16:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-03 12:03 Rik van Riel
1998-12-04 10:41 ` Neil Conway
1998-12-04 14:49 ` Stephen C. Tweedie
1998-12-04 15:23 ` Rik van Riel [this message]
1998-12-05 7:51 ` MOLNAR Ingo
1998-12-04 12:05 ` Stephen C. Tweedie
[not found] ` <3667E533.ADFBFDBB@bull.net>
1998-12-04 14:47 ` Stephen C. Tweedie
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