From: Linus Torvalds <torvalds@transmeta.com>
To: Lorenzo Allegrucci <lenstra@tiscalinet.it>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: VM: qsbench numbers
Date: Sun, 4 Nov 2001 09:18:02 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.33.0111040913370.6919-100000@penguin.transmeta.com> (raw)
In-Reply-To: <3.0.6.32.20011104151152.01fdaea0@pop.tiscalinet.it>
On Sun, 4 Nov 2001, Lorenzo Allegrucci wrote:
>
> I begin with the last Linus' kernel, three runs and kswapd CPU
> time appended.
It's interesting how your numbers decrease with more swap-space. That,
together with the fact that the "more swap space" case also degrades the
second time around seems to imply that we leave swap-cache pages around
after they aren't used.
Does "free" after a run has completed imply that there's still lots of
swap used? We _should_ have gotten rid of it at "free_swap_and_cache()"
time, but if we missed it..
What happens if you make the "vm_swap_full()" define in <linux/swap.h> be
unconditionally defined to "1"? That should make us be more aggressive
about freeing those swap-cache pages, and it would be interesting to see
if it also stabilizes your numbers.
Linus
next prev parent reply other threads:[~2001-11-04 17:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.33.0111040913370.6919-100000@penguin.transmeta. com>
2001-11-04 14:11 ` VM: qsbench numbers Lorenzo Allegrucci
2001-11-04 17:18 ` Linus Torvalds [this message]
2001-11-04 21:17 ` Lorenzo Allegrucci
2001-11-05 1:03 ` Linus Torvalds
2001-11-05 15:30 Lorenzo Allegrucci
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