Date: Wed, 22 Nov 2000 00:14:19 +1100
To: linux-kernel@vger.kernel.org
Subject: bdflush way too agressive
Message-ID: <20001122001419.E3430@linuxcare.com>
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From: Anton Blanchard <anton@linuxcare.com>
Sender: linux-kernel-owner@vger.kernel.org


Hi,

The current defaults for bdflush make it start async flushing when 20% of
buffers are dirty and sync flush when 40% of buffers are dirty. I think
these defaults are way off but apparently it is intentional. (sync flushing
should be a last ditch effort when free memory is getting low and 40%
on our 2G RAM test machine is not low!).

Regardless of my opinions there remains the problem that I cannot set sane
values for these options since one is hardcoded as 2 times the other. We
should have another bdflush sysctl variable so it can be tuned (eg in
my case 90%/95%).

Anton
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