[xfs-masters] xfs deadlock in stable kernel 3.0.4

[Stefan Priebe - Profihost AG]

Hi,

Am 21.09.2011 14:26, schrieb Christoph Hellwig:
> What is also strange is that we allocate a xfs_ail_wq, but don't
> actually use it, although it would have the same idea.  Stefan,
> can you try the following patch?  This moves the ail work to it's
> explicit queue, and makes sure we never have the same work item
> (= same fs to be pushed) concurrently.

Sorry, but with your patch everything is awfully slow. Just the sequ. 
file creation takes on an SSD extremely long. I interrupted the test.

i/o top from an SSD:
Total DISK READ: 0 B/s | Total DISK WRITE: 9.88 M/s
   PID USER      DISK READ  DISK WRITE   SWAPIN    IO>    COMMAND 

  1377 root           0 B/s       0 B/s  0.00 % 99.99 % [xfsbufd/sda3]
  2219 root           0 B/s       0 B/s  0.00 % 99.99 % [flush-8:0]
  2746 root           0 B/s    9.88 M/s  0.00 %  0.00 % bonnie++ -u root 
-s 0 -n 1024:32768:0:1024:4096 -d /mnt

Stefan