Chromium hdd thrashing with btrfs

Chromium hdd thrashing with btrfs

[Alex Dedul]

Hi!

Quite a bit of time i'm watching in chromium strange behavior when
downloading files - after like 2Mb of any download it starts hdd
thrashing(with hdd noise/lots of seeks or the like). After some
research and seeing like no one else experiencing this i tried to
switch ~/.cache/chromium to ext4 fs - and on it no hdd thrashing
occurs. So this is seems like btrfs related issue. After talking on
#btrfs with cmason about this i'm attaching now vmstats and strace log
of what is going on:

--- normal state ---
plisk .cache # vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0      0  36168  39720 1405324    0    0   148   179  384 1402  8  3 76 13

--- thrashing state ---
plisk .cache # vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0      0  47304  52592 1377932    0    0   137   174  380 1469  8  3 77 12

Strace log is here
http://narod.ru/disk/14617356000/strace-log.bz2.html (just put an
captcha on the bottom left)

With best regards from the Soul, Alex.