Re: Performance degradation

2010-09-26 Thread Daniel J Blueman
Hi Dave, On 24 September 2010 20:39, Dave Cundiff wrote: >>> It shouldn't but it depends on how much metadata we have to read in to >>> process the snapshots.  Could you do a few sysrq-w?  We'll see where you >>> are spending your time based on the traces. >> >> Also, using 'perf' may give a good

Re: Performance degradation

2010-09-24 Thread Dave Cundiff
>> It shouldn't but it depends on how much metadata we have to read in to >> process the snapshots.  Could you do a few sysrq-w?  We'll see where you >> are spending your time based on the traces. > > Also, using 'perf' may give a good picture of where the time is spent, eg: > > $ sudo perf record

Re: Performance degradation

2010-09-22 Thread Daniel J Blueman
On 22 September 2010 01:02, Chris Mason wrote: > On Tue, Sep 21, 2010 at 12:27:03AM -0400, Dave Cundiff wrote: >> On Mon, Sep 20, 2010 at 9:19 PM, K. Richard Pixley wrote: >> > Do you have any kernel processes running constantly?  Any taking near 100% >> > of a CPU? >> > >> > --rich >> > >> >> N

Re: Performance degradation

2010-09-21 Thread Chris Mason
On Tue, Sep 21, 2010 at 12:27:03AM -0400, Dave Cundiff wrote: > On Mon, Sep 20, 2010 at 9:19 PM, K. Richard Pixley wrote: > > Do you have any kernel processes running constantly?  Any taking near 100% > > of a CPU? > > > > --rich > > > > Now that I look again, it seems that the btrfs-cleaner pro

Re: Performance degradation

2010-09-20 Thread Dave Cundiff
On Mon, Sep 20, 2010 at 9:19 PM, K. Richard Pixley wrote: > Do you have any kernel processes running constantly?  Any taking near 100% of > a CPU? > > --rich > Now that I look again, it seems that the btrfs-cleaner process is still running. CPU isn't much of an issue on this box. Its a dual quad

Re: Performance degradation

2010-09-20 Thread K. Richard Pixley
Do you have any kernel processes running constantly? Any taking near 100% of a CPU? --rich On Sep 20, 2010, at 14:24, Dave Cundiff wrote: > Hi, > > I have a btrfs backup system that has been running great. Its been > backing up 6 systems with 500-750 gigs of data using Rsync and > snapshots.