On Thu, 22 Jan 2004, Peter Ruskin wrote: > On Thursday 22 Jan 2004 13:26, Mark Knecht wrote: > > On Thu, 2004-01-22 at 04:39, Peter Ruskin wrote: > > > On Thursday 22 Jan 2004 04:05, Mark Knecht wrote: > > > > QUESTION: how do I test these devices (cdrw and dvdr drives) to > > > > ensure DMA is still enabled? I cannot figure out yet what > > > > parameters to give hdparm -I /dev/WHAT? > > > > > > > > Wizard root # hdparm -I /dev/cdroms/cdrom0 > > > > /dev/cdroms/cdrom0 not supported by hdparm > > > > > > If you're using ide-scsi those devices are not supported by hdparm. > > > (Someone tell me if I'm wrong). > > > > Right. That's what I see. So my question is that we know the devices > > are attached to an IDE controller and we want to determine whether > > DMA is enabled for the IDE controller. How do we do it? > > > > 1) Some different program *like* hdparm that tells us? > > > > 2) Run some sort of benchmark that shows us? > > > > 3) Something else? > > > > Of course, you've sort of shown me that I might not need SCSI > > emulation anyway, but I'm not sure which way to go and why just yet, > > so I'd like to know how to make DMA is enabled in the channel. > > > I googled some time back for a solution to this, tried a few > suggestions, none of which worked. As far as I can see, if you're > using scsi emulation you can forget about DMA.
That doesn't seem right, after my experiences with SuSE. (I'l still in the process of my first Gentoo install...) I have a combo CD-RW/DVD drive that uses SCSI emulation (under SuSE). I discovered the need to turn DMA on when DVDs/VCDs wouldn't play back correctly. (Jumpy playback...) I turned it on with their gui, and everything worked correctly. On the flip side, when playing aroung with Fedora, SCSI emulation simply wasn't needed. I did have problems with playback on one of the computers, but that was tied in with the video driver I was using. (I haven't had a chance to push the limit with Gentoo, so later on I may ask for help with finding the right driver, but I'm still in the poking around stage.) So, DMA can be used, but how it's done under Gentoo is beyond me. But it might not be needed. (With Fedora, it was a complete non-issue.) Krikket -- [EMAIL PROTECTED] mailing list
