Re: [4.8] btrfs heats my room with lock contention

2016-08-05 Thread Chris Mason
On 08/04/2016 11:01 PM, Dave Chinner wrote: On Thu, Aug 04, 2016 at 10:28:44AM -0400, Chris Mason wrote: On 08/04/2016 02:41 AM, Dave Chinner wrote: Simple test. 8GB pmem device on a 16p machine: # mkfs.btrfs /dev/pmem1 # mount /dev/pmem1 /mnt/scratch # dbench -t 60 -D /mnt/scratch 16 An

Re: [4.8] btrfs heats my room with lock contention

2016-08-04 Thread Dave Chinner
On Thu, Aug 04, 2016 at 10:28:44AM -0400, Chris Mason wrote: > > > On 08/04/2016 02:41 AM, Dave Chinner wrote: > > > >Simple test. 8GB pmem device on a 16p machine: > > > ># mkfs.btrfs /dev/pmem1 > ># mount /dev/pmem1 /mnt/scratch > ># dbench -t 60 -D /mnt/scratch 16 > > > >And heat your room wit

Re: [4.8] btrfs heats my room with lock contention

2016-08-04 Thread Chris Mason
On 08/04/2016 02:41 AM, Dave Chinner wrote: Simple test. 8GB pmem device on a 16p machine: # mkfs.btrfs /dev/pmem1 # mount /dev/pmem1 /mnt/scratch # dbench -t 60 -D /mnt/scratch 16 And heat your room with the warm air rising from your CPUs. Top half of the btrfs profile looks like: 36.71%

[4.8] btrfs heats my room with lock contention

2016-08-03 Thread Dave Chinner
Simple test. 8GB pmem device on a 16p machine: # mkfs.btrfs /dev/pmem1 # mount /dev/pmem1 /mnt/scratch # dbench -t 60 -D /mnt/scratch 16 And heat your room with the warm air rising from your CPUs. Top half of the btrfs profile looks like: 36.71% [kernel] [k] _raw_spin_unlock_irqrestore