Re: OOM killer changes

[Ralf-Peter Rohbeck <Ralf-Peter.Rohbeck@quantum.com>]

On 01.08.2016 12:43, Michal Hocko wrote:
> On Mon 01-08-16 12:35:51, Ralf-Peter Rohbeck wrote:
>> On 01.08.2016 12:26, Michal Hocko wrote:
> [...]
>>> the amount of dirty pages is much smaller as well as the anonymous
>>> memory. The biggest portion seems to be in the page cache. The memory
>> The page cache will always be full if I'm writing at full steam to multiple
>> drives, no?
> Yes, the memory full of page cache is not unusual. The large portion of
> that memory being dirty/writeback can be a problem. That is why we have
> a dirty memory throttling which slows down (throttles) writers to keep
> the amount reasonable. What is your dirty throttling setup?
> $ grep . /proc/sys/vm/dirty*
>
> and what is your storage setup?

root@fs:~# grep . /proc/sys/vm/dirty*
/proc/sys/vm/dirty_background_bytes:0
/proc/sys/vm/dirty_background_ratio:10
/proc/sys/vm/dirty_bytes:0
/proc/sys/vm/dirty_expire_centisecs:3000
/proc/sys/vm/dirty_ratio:20
/proc/sys/vm/dirtytime_expire_seconds:43200
/proc/sys/vm/dirty_writeback_centisecs:500


Storage setup:

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.

----------------------------------------------------------------------
The information contained in this transmission may be confidential. Any disclosure, copying, or further distribution of confidential information is not permitted unless such privilege is explicitly granted in writing by Quantum. Quantum reserves the right to have electronic communications, including email and attachments, sent across its networks filtered through anti virus and spam software programs and retain such messages in order to comply with applicable data security and retention requirements. Quantum is not responsible for the proper and complete transmission of the substance of this communication or for any delay in its receipt.

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