[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

Please ignore this mail. Use the wrong disk. *gr* slow SATA

Stefan