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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>