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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
