On Wed, 12 Oct 2005, Phil Strong wrote: > I recently upgraded my box with a shiny new Seagate SATA (400GB) a new video > card, processor, etc basically is all new. > > I installed a fresh copy of FC4 and everything seemed to work fine. Went to > play videos and/or DVD's and the video is jumpy/slow. I did some research > and found I should make sure DMA is on for my HD. It is in fact turned off. > > /boot 250mb ext3 > / 10GB ext3 > /swap 1GB > /video 3** GB JFS > > First I tried to us hdparm -u1 /dev/hda but it tells me it can't enable DMA
i seem to remember the flag is -d1, not -u1. > I even tried unmounting /dev/hda5 (/video) and just enabling on that but to > no avail. I've done it on running drives. Look at what your /etc/sysconfig/harddisks file says, which is creating during install. It might have some comments in it. Then reboot if you find you are trying out some different options. On my fc4 i've been having some weird performance issues, which i swear is something of newer kernels. I have dma turned on (!!) for the dvd, but could not play dvd's without terrible jerking. Turned it off, and i could watch dvd's again... weird. peter
