[CentOS] pdflush kernel thread pops up every 10 seconds or so and video decoding grinds to a halt for 1/2 a second

[JohnS]

On Mon, 2010-10-18 at 18:25 -0700, Aleksey Tsalolikhin wrote:
> Hi. A friend of mine was doing real-time video decoding on
> Fedora Core 13 and he had a performance glitch (1/2 a second
> freeze) every 5-10 seconds.  "top" showed flush-253:0
> process at the moment of the freeze.

And what is the Priority of it running at?  How many Cores also?

> He also tried CentOS 5.5, and saw a "pdflush" process popping
> up with the same frequency, and resulting in a similar glitch.
> 
> Any other suggestions?
I would not even be concerned. ATM I am seeing pdflush on a server pop
every second.
load average: 4.51, 3.41, 3.51

I would only be concerned with the Freeze.  What's uname -a on the
CentOS machine?

John