Messages in this thread | | | Date | Tue, 9 Apr 2013 12:14:37 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH] mm: page_alloc: Avoid marking zones full prematurely after zone_reclaim() |
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On Tue 09-04-13 18:05:30, Simon Jeons wrote: [...] > >I try this in v3.9-rc5: > >dd if=/dev/sda of=/dev/null bs=1MB > >14813+0 records in > >14812+0 records out > >14812000000 bytes (15 GB) copied, 105.988 s, 140 MB/s > > > >free -m -s 1 > > > > total used free shared buffers > >cached > >Mem: 7912 1181 6731 0 663 239 > >-/+ buffers/cache: 277 7634 > >Swap: 8011 0 8011 > > > >It seems that almost 15GB copied before I stop dd, but the used > >pages which I monitor during dd always around 1200MB. Weird, why? > > > > Sorry for waste your time, but the test result is weird, is it?
I am not sure which values you have been watching but you have to realize that you are reading a _partition_ not a file and those pages go into buffers rather than the page chache. -- Michal Hocko SUSE Labs
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