[CentOS] CentOS 5 - problem with kernel/process: task blocked for more than 120 seconds.

[Steve Thompson]

On Wed, 11 Apr 2012, m.roth at 5-cent.us wrote:

> Steve Thompson wrote:
>> On Wed, 11 Apr 2012, m.roth at 5-cent.us wrote:
>>
>>> Been seeing that on 6.2, also, though I've not noticed them locking up
>>> (the ones that have were in a cluster, and someone could have hosed
>>> memory). It got less with the latest kernel, but I'm still seeing them
>>> occasionally.
>>
>> This is most likely a problem due to data arriving too quickly for the VM
>> subsystem to flush dirty pages to disk to keep up; the kernel switches to
>> synchronous mode when the dirty_ratio percentage of memory pages is used.
>> You might try upping your dirty_ratio, or reducing it drastically.
>>
> But mine are *not* VMs.

VM = Virtual Memory.