Messages in this thread | | | Subject | Re: 2.6 vm/elevator loading down disks where 2.4 does not | From | Clint Byrum <> | Date | Fri, 11 Jun 2004 09:45:36 -0700 |
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On Wed, 2004-06-09 at 16:25, Andrew Morton wrote: > Possibly a memory zone problem. Could you try booting with "mem=896m" on > the kernel command line, see how that affects things?
This took a while longer to try, as I didn't want to unfairly test it against a box with 1G of RAM. So I rebooted my 2.4.23 and 2.6.7-rc3 test boxes with mem=896m. No change in the 5:1 ratio when comparing 2.6's disk reads to 2.4's. Of course, both boxes ended up reading from the disk more often, as they had less RAM for cache. I was unable to run a long test as I did before, but I'm confident the 3 hours I did run tests for show that this isn't a memory zone problem.
I still think this behavior is happening because useful pages are being removed from the page cache too soon. Maybe this is happening because of excessive readahead?
-cb
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