Re: OOM killer changes

[Michal Hocko <mhocko@suse.cz>]

On Mon 01-08-16 13:16:49, Ralf-Peter Rohbeck wrote:
> 
> 
> On 08/01/16 13:09, Michal Hocko wrote:
> > On Mon 01-08-16 12:52:40, Ralf-Peter Rohbeck wrote:
[...]
> > > root@fs:~# lsscsi
> > > [0:2:0:0]    disk    LSI      MR9271-8iCC      3.29  /dev/sda
> > > [0:2:1:0]    disk    LSI      MR9271-8iCC      3.29  /dev/sdb
> > > [9:0:0:0]    disk    TOSHIBA  External USB 3.0 5438  /dev/sdf
> > > [10:0:0:0]   disk    Seagate  Backup+ Desk     050B  /dev/sdc
> > > [11:0:0:0]   disk    Seagate  Expansion Desk   9400  /dev/sdd
> > > [12:0:0:0]   disk    Seagate  Backup+ Desk     050B /dev/sde
> > > [13:0:0:0]   disk    Seagate  Expansion Desk   9400 /dev/sdg
> > > [14:0:0:0]   disk    TOSHIBA  External USB 3.0 5438 /dev/sdl
> > > [15:0:0:0]   disk    Seagate  Expansion Desk   9400 /dev/sdh
> > > [16:0:0:0]   disk    Seagate  Expansion Desk   9400 /dev/sdi
> > > [17:0:0:0]   disk    TOSHIBA  External USB 3.0 5438 /dev/sdm
> > > [18:0:0:0]   disk    Seagate  Expansion Desk   9400 /dev/sdj
> > > [19:0:0:0]   disk    Seagate  Expansion Desk   9400  /dev/sdk
> > > 
> > > sda is a 6x 1TB RAID5 and sdb is a single 480GB SSD, both on a MegaRAID
> > > controller.
> > > 
> > > The rest are 4TB USB drives that I'm experimenting with.
> > Which devices did you write when hitting the OOM killer?
> sdc, sdd and sde each at max speed, with a little bit of garden variety IO
> on sda and sdb.

So do I get it right that the majority of the IO is to those slower USB
disks?  If yes then does lowering the dirty_bytes to something smaller
help?
-- 
Michal Hocko
SUSE Labs

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