7.1-RELEASE I/O hang

[Kostik Belousov]

On Thu, Feb 05, 2009 at 11:26:58AM +0000, Matt Burke wrote:
> Kostik Belousov wrote:
> > Compile ddb into the kernel, and do "ps" from the ddb prompt. If there
> > are processes hung in the "nbufkv" state, then the patch below might
> > help.
> 
> The bonnie++ processes are in state "newbuf" and other hung processes
> (bash, newly forked sshds, etc) appear to be in the "ufs" state.
What is the state of the bufdaemon process ?

> 
> The patch appears to have no effect, although at the last hang I did see
> one of the bonnie++ processes in "nbufkv" state. This could be coincidental.
> 
> 
> The problem also exhibits itself when running a parallel bonnie++ on a
> single array, both with the onboard PERC6/i and the PERC6/e. I have no
> access to other controllers.
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