Re: That greedy Linux VM cache

2014-02-10 Thread Michal Hocko
On Sun 09-02-14 03:42:52, Igor Podlesny wrote: > On 3 February 2014 18:55, Michal Hocko wrote: > > [Adding linux-mm to the CC] > > [...] > > > This means that the page has to be written back in order to be dropped. > > How much dirty memory you have (comparing to the total size of the page > >

Re: That greedy Linux VM cache

2014-02-10 Thread Michal Hocko
On Sun 09-02-14 03:42:52, Igor Podlesny wrote: On 3 February 2014 18:55, Michal Hocko mho...@suse.cz wrote: [Adding linux-mm to the CC] [...] This means that the page has to be written back in order to be dropped. How much dirty memory you have (comparing to the total size of the page

Re: That greedy Linux VM cache

2014-02-08 Thread Igor Podlesny
On 3 February 2014 18:55, Michal Hocko wrote: > [Adding linux-mm to the CC] [...] > This means that the page has to be written back in order to be dropped. > How much dirty memory you have (comparing to the total size of the page > cache)? Not too many. May be you missed that part, but I

Re: That greedy Linux VM cache

2014-02-08 Thread Igor Podlesny
On 3 February 2014 18:55, Michal Hocko mho...@suse.cz wrote: [Adding linux-mm to the CC] [...] This means that the page has to be written back in order to be dropped. How much dirty memory you have (comparing to the total size of the page cache)? Not too many. May be you missed that

Re: That greedy Linux VM cache

2014-02-03 Thread Michal Hocko
[Adding linux-mm to the CC] On Fri 31-01-14 00:58:16, Igor Podlesny wrote: >Hello! > >Probably every Linux newcomer's going to have concerns regarding > low free memory and hear an explanation from Linux old fellows that's > actually there's plenty of -- it's just cached, but when it's

Re: That greedy Linux VM cache

2014-02-03 Thread Michal Hocko
[Adding linux-mm to the CC] On Fri 31-01-14 00:58:16, Igor Podlesny wrote: Hello! Probably every Linux newcomer's going to have concerns regarding low free memory and hear an explanation from Linux old fellows that's actually there's plenty of -- it's just cached, but when it's needed

Re: That greedy Linux VM cache

2014-01-31 Thread Henrique de Moraes Holschuh
On Fri, 31 Jan 2014, Igor Podlesny wrote: >Probably every Linux newcomer's going to have concerns regarding > low free memory and hear an explanation from Linux old fellows that's > actually there's plenty of -- it's just cached, but when it's needed > for applications it's gonna be used -- on

Re: That greedy Linux VM cache

2014-01-31 Thread Igor Podlesny
[...] On 1 February 2014 00:57, Austin S. Hemmelgarn wrote: > If I remember correctly, there is a sysctl for configuring how > aggressively the system tries to retain the VFS cache, changing the > value there might improve things for you. Yeah, in theory. On practice I never saw a difference

Re: That greedy Linux VM cache

2014-01-31 Thread Austin S. Hemmelgarn
On 01/31/2014 09:47 AM, Igor Podlesny wrote: > On 31 January 2014 00:58, Igor Podlesny wrote: > [...] >> While I'm thinking about moving system back to XFS... > >Well, it helped just a bit. The whole picture remains, so it's not > Btrfs' issue, but seemingly Linux VM's one. The problem

Re: That greedy Linux VM cache

2014-01-31 Thread Igor Podlesny
On 31 January 2014 00:58, Igor Podlesny wrote: [...] > While I'm thinking about moving system back to XFS... Well, it helped just a bit. The whole picture remains, so it's not Btrfs' issue, but seemingly Linux VM's one. The problem can be briefly described as "if allowed to swap (swappiness

Re: That greedy Linux VM cache

2014-01-31 Thread Austin S. Hemmelgarn
On 01/31/2014 09:47 AM, Igor Podlesny wrote: On 31 January 2014 00:58, Igor Podlesny for.poige+li...@gmail.com wrote: [...] While I'm thinking about moving system back to XFS... Well, it helped just a bit. The whole picture remains, so it's not Btrfs' issue, but seemingly Linux VM's

Re: That greedy Linux VM cache

2014-01-31 Thread Igor Podlesny
[...] On 1 February 2014 00:57, Austin S. Hemmelgarn ahferro...@gmail.com wrote: If I remember correctly, there is a sysctl for configuring how aggressively the system tries to retain the VFS cache, changing the value there might improve things for you. Yeah, in theory. On practice I never

Re: That greedy Linux VM cache

2014-01-31 Thread Henrique de Moraes Holschuh
On Fri, 31 Jan 2014, Igor Podlesny wrote: Probably every Linux newcomer's going to have concerns regarding low free memory and hear an explanation from Linux old fellows that's actually there's plenty of -- it's just cached, but when it's needed for applications it's gonna be used -- on

Re: That greedy Linux VM cache

2014-01-31 Thread Igor Podlesny
On 31 January 2014 00:58, Igor Podlesny for.poige+li...@gmail.com wrote: [...] While I'm thinking about moving system back to XFS... Well, it helped just a bit. The whole picture remains, so it's not Btrfs' issue, but seemingly Linux VM's one. The problem can be briefly described as if

Re: That greedy Linux VM cache

2014-01-30 Thread David Lang
On Fri, 31 Jan 2014, Igor Podlesny wrote: Hello! Probably every Linux newcomer's going to have concerns regarding low free memory and hear an explanation from Linux old fellows that's actually there's plenty of -- it's just cached, but when it's needed for applications it's gonna be used

Re: That greedy Linux VM cache

2014-01-30 Thread David Lang
On Fri, 31 Jan 2014, Igor Podlesny wrote: Hello! Probably every Linux newcomer's going to have concerns regarding low free memory and hear an explanation from Linux old fellows that's actually there's plenty of -- it's just cached, but when it's needed for applications it's gonna be used