Re: RFC: dirty_ratio back to 40%

[David Miller]

From: Larry Woodman <lwoodman@xxxxxxxxxx>
Date: Thu, 20 May 2010 07:20:42 -0400

> Increasing the dirty_ratio to 40% will regain the performance loss
> seen in several benchmarks.  Whats everyone think about this???

I've been making this change via sysctl on every single system I have,
and have been doing so for quite some time.

When doing a lot of GIT operations to a non-SSD disk the kernel simply
can't submit the writes early enough to prevent everything getting
backlogged, and then processes pile up being forced to sleep on I/O
for several seconds at a time.

I therefore totally support making this the default, but I know some
people will be against it :-)

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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