Re: Updated performance results

Chris Mason
2009-09-16T18:07:19Z

On Wed, Sep 16, 2009 at 12:57:22PM -0500, Steven Pratt wrote:
> Steven Pratt wrote:
> >Chris Mason wrote:
> >>On Mon, Sep 14, 2009 at 04:41:48PM -0500, Steven Pratt wrote:
> >>>Only bit of bad news is I did get one error that crashed the system
> >>>on single threaded nocow run. So that data point is missing.
> >>>Output below:
> >>
> >>I hope I've got this fixed. If you pull from the master branch of
> >>btrfs-unstable there are fixes for async thread races. The single
> >>patch I sent before is included, but not enough.
> >Glad you said that. Keeps me from sending the email that said the
> >patch didn't help :-)
> >
> >Steve
> Well, still getting oopses even with new code.
>
> Lots of:
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] BUG: soft lockup -
> CPU#10 stuck for 61s! [btrfs-endio-1:30250]
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] Pid: 30250, comm:
> btrfs-endio-1 Not tainted 2.6.31-autokern1 #1 IBM x3950-[88726RU]-
> Sep 16 11:07:27 btrfs1 kernel: [ 1862.942754] RIP:
> 0010:[<ffffffff81153920>] [<ffffffff81153920>] crc32c+0x20/0x26

If I'm reading this right, you've got a softlockup in crc32c? Something
has gone really wrong here. Are you reusing datasets from old runs?

-chris