More data: this happens about every 5-20 seconds. It's a hexacore machine. We tried Fedora 14 beta but still seeing the glitch in the decoding when flush runs every 5-20 seconds. Any suggestions? Best, -at On Mon, Oct 18, 2010 at 6:23 PM, Aleksey Tsalolikhin <atsaloli.tech@xxxxxxxxx> 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. > > Major device number 253 corresponds to device-mapper. I advised my > friend to re-install his FC13 without LVM, to see if the glitch > is related to LVM. > > After re-installing FC13 without LVM, he is seeing the glitch > every 10 seconds, and it shows flush-8:16 where before it said > flush-253:0. 8 is scsi disk driver. So it's not an LVM thing... > maybe a kernel thing? > > I suggested he try Fedora 14 beta, as it has a newer kernel. > Maybe this kernel thing is fixed in the newer kernel. > > BTW, 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? > > Best, > -at > -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
