On Tue, 2009-10-20 at 19:03 +0200, Holger Weiss wrote: > Package: linux-image-2.6.26-2-686-bigmem > Version: 2.6.26-19 > Severity: normal > File: /boot/vmlinuz-2.6.26-2-686-bigmem > Tags: patch > > We encountered a serious disk write performance regression after > upgrading from the etch kernel (2.6.18) to the etchnhalf kernel > (2.6.24). [...] > The attached patch should be applicable to both 2.6.26 from lenny and > 2.6.24 from etchnhalf.
Although it is apparently beneficial for your workload, it might have
negative effects on others. This change has not been applied to the
2.6.27 stable series so I'm not convinced that it is suitable material
for a Debian stable update either.
These variables can be changed by sysctl, so I recommend that instead of
patching your kernel you add these lines to /etc/sysctl.conf:
vm.dirty_background_ratio = 10
vm.dirty_ratio = 20
Ben.
--
Ben Hutchings
Everything should be made as simple as possible, but not simpler.
- Albert Einstein
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