On Mon, Dec 27, 2010 at 08:16:29AM +0200, Petre Rodan wrote:
> Hello Dave,
> On Mon, Dec 27, 2010 at 01:19:04PM +1100, Dave Chinner wrote:
> > On Thu, Dec 23, 2010 at 06:55:32PM +0200, Petre Rodan wrote:
> > >
> > > Hello,
> > > upon closer inspection it turns out that after the first Write
> > > action to that partition, an xfssyncd process continues to write
> > > to that partition each 36 seconds and it doesn't stop doing that,
> > > even if there are no more Writes from the exterior. this keeps the
> > > drive busy with varying consequences. more about that later.
> > Should be fixed in 2.6.37 by the commit:
> > 1a387d3 xfs: dummy transactions should not dirty VFS state
> nice that someone else was also keen on having this bug fixed, but this
> particular fix is already present in 2.6.36 , 
> unfortunately something is still written to the log every 36s, as per the
> first mail in this thread.
Turn on the XFS tracing so we can see what is being written every
36s. When the problem shows up:
# echo 1 > /sys/kernel/debug/tracing/events/xfs/enable
# sleep 100
# cat /sys/kernel/debug/tracing/trace > trace.out
# echo 0 > /sys/kernel/debug/tracing/events/xfs/enable
And post the trace.out file for us to look at.