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SubjectRe: Page cache write performance issue
Nathan Scott <nathans@sgi.com> wrote:
>
> So, any ideas what happened to 2.6.9?

Does reverting the below fix it up?

> Whats the rationale for commencing writeout earlier in 2.6
> (even when there's
> so much free memory available)?

There wasn't much rationale behind that patch - that's why I dropped it the
first three times ;) I have no problem with making it four times.

It could be that small values of unmapped_ratio are making background_ratio
too small.


--- a/mm/page-writeback.c 10 Aug 2004 04:16:17 -0000 1.43
+++ a/mm/page-writeback.c 13 Oct 2004 06:12:03 -0000
@@ -153,9 +153,11 @@
if (dirty_ratio < 5)
dirty_ratio = 5;

- background_ratio = dirty_background_ratio;
- if (background_ratio >= dirty_ratio)
- background_ratio = dirty_ratio / 2;
+ /*
+ * Keep the ratio between dirty_ratio and background_ratio roughly
+ * what the sysctls are after dirty_ratio has been scaled (above).
+ */
+ background_ratio = dirty_background_ratio * dirty_ratio/vm_dirty_ratio;

background = (background_ratio * total_pages) / 100;
dirty = (dirty_ratio * total_pages) / 100;
-
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