Nate Diller wrote:
just found the culprit. guess i should have read the code the first
time. get_dirty_limits() in drivers/block/page_writeback.c has a
hard-coded upper limit to dirty_ratio. it's capped to half of the
unmapped pages, so maybe 30-40% of your system's memory. so if you are
brave, just remove the "/ 2" parts from the 'if (dirty_ratio >
unmapped_ratio / 2) dirty_ratio = unmapped_ratio / 2;' check, and you
can have all the OOM goodness you want.
Excellent. OOM here I come.
i really recommend you focus on getting better disk bandwidth, you stand
to gain a lot more from that approach. i presume you're on ext3;
perhaps you should try reiser4 or xfs, they are more likely to meet your
disk bandwidth requirements.
Yep, pursuing this as well, also looking to add more RAM to the machine. At this stage
I was just trying to understand the numbers that I was seeing, so I could work out the
best way to proceed.
I'm using ext2 at the moment, on the assumption that the journal would cost
me a bit of performance so I left it out :-)
I'll certainly try the other filesystems as you suggest.
Thanks again, Anthony
--
Anthony Wesley
Director and IT/Network Consultant
Smart Networks Pty Ltd
Acquerra Pty Ltd
[email protected]
Phone: (02) 62595404 or 0419409836
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