On Monday, October 18, 2010 09:25:41 pm 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. [snip] > 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? What kind of hard drive is this? How is/are your drive(s) set up? You need the iostat program (in the sysstat package, I think) to give you more detail; there are some pointers to its use in this list's archives.