kern/104406: [ufs] Processes get stuck in "ufs" state under persistent CPU load

[Rainer Hurling]

Thanks for your answer.

Kris Kennaway schrieb:
> Rainer Hurling wrote:
>> Looking into PR kern/104406 it seems, that this describes exactly what 
>> I am experiencing on three of my systems over the last weeks. They are 
>> running FreeBSD 8.0-CURRENT (known as 7.0-CURRENT not long ago ;-) ).
> 
> Actually it sounds nothing like it at all ;)
> 
>> On these machines I often observe hangings, sometimes only a few 
>> seconds, on other times 20-30 seconds before input/output is back. 
>> This seems to happen when more extensive disk usage is needed 
>> (portupgrade, buildworld, browsing complicated websites etc.). During 
>> the hang even xterm is not responding any more, other (diskless) 
>> applications like xclock keep to continue. I have no panics, only UFS 
>> (and MSDOSFS) are mounted, no NTFS. About two months ago none of my 
>> systems showed these hangings.
> 
> Is your system swapping?  This is the usual cause of pauses during high 
> application (actually memory) load.
> 
> Kris

No, I am working with 2GB RAM, without swapping at all.

In the meantime I tested the above described behaviour a little more. 
The hangings even appeared without using Xorg, only working on consoles 
under heavy disk usage (portupgrade etc.).

Rainer