On Tue, Jul 10, 2012 at 5:44 AM, Andres Freund <andres@2ndquadrant.com> wrote:
> On Tuesday, July 10, 2012 08:14:00 AM Maxim Boguk wrote:
>>
>> So kernel doesn't start write any pages out in background before it has at
>> least 13Gb dirty pages in kernel memory.
>> And at end of the checkpoint kernel trying flush all dirty pages to disk.
> Thast not entirely true. The kernel will also writeout pages which haven't
> been written to for dirty_expire_centisecs.
There seems to be many situations in which it totally fails to do that.
Although I've never been able to categorize just what those situations are.
Cheers,
Jeff