Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-08-01 Thread Jan Kara
On Thu 01-08-13 15:48:05, Dave Chinner wrote: > On Wed, Jul 31, 2013 at 04:40:19PM +0200, Jan Kara wrote: > > On Wed 31-07-13 14:15:40, Dave Chinner wrote: > > > From: Dave Chinner > > > > > > Doing writeback on lots of little files causes terrible IOPS storms > > > because of the per-mapping

Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-08-01 Thread Jan Kara
On Thu 01-08-13 15:48:05, Dave Chinner wrote: On Wed, Jul 31, 2013 at 04:40:19PM +0200, Jan Kara wrote: On Wed 31-07-13 14:15:40, Dave Chinner wrote: From: Dave Chinner dchin...@redhat.com Doing writeback on lots of little files causes terrible IOPS storms because of the

Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-07-31 Thread Dave Chinner
On Wed, Jul 31, 2013 at 04:40:19PM +0200, Jan Kara wrote: > On Wed 31-07-13 14:15:40, Dave Chinner wrote: > > From: Dave Chinner > > > > Doing writeback on lots of little files causes terrible IOPS storms > > because of the per-mapping writeback plugging we do. This > > essentially causes

Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-07-31 Thread Jan Kara
On Wed 31-07-13 14:15:40, Dave Chinner wrote: > From: Dave Chinner > > Doing writeback on lots of little files causes terrible IOPS storms > because of the per-mapping writeback plugging we do. This > essentially causes imeediate dispatch of IO for each mapping, > regardless of the context in

Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-07-31 Thread Jan Kara
On Wed 31-07-13 14:15:40, Dave Chinner wrote: From: Dave Chinner dchin...@redhat.com Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially causes imeediate dispatch of IO for each mapping, regardless of the

Re: [PATCH 01/11] writeback: plug writeback at a high level

2013-07-31 Thread Dave Chinner
On Wed, Jul 31, 2013 at 04:40:19PM +0200, Jan Kara wrote: On Wed 31-07-13 14:15:40, Dave Chinner wrote: From: Dave Chinner dchin...@redhat.com Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially

[PATCH 01/11] writeback: plug writeback at a high level

2013-07-30 Thread Dave Chinner
From: Dave Chinner Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially causes imeediate dispatch of IO for each mapping, regardless of the context in which writeback is occurring. IOWs, running a concurrent

[PATCH 01/11] writeback: plug writeback at a high level

2013-07-30 Thread Dave Chinner
From: Dave Chinner dchin...@redhat.com Doing writeback on lots of little files causes terrible IOPS storms because of the per-mapping writeback plugging we do. This essentially causes imeediate dispatch of IO for each mapping, regardless of the context in which writeback is occurring. IOWs,