On Wednesday 05 December 2007, Garrison Hoffman wrote: > Chris Knadle wrote: > > MythTV requires being able to store large files but also write a lot > > of data. My guess is that you're running into a filesystem write > > contention problem; adding memory adds cache space which helps a little, > > but doesn't fully address the issue concerning write speed. Biggest > > tweak to write speed I can suggest for starters is DMA + 32-bit access by > > tweaking with 'hdparm'. > > I had considered this but I have S-ATA drives and `sudo hdparm -c > /dev/sda` says: > > /dev/sda: > setting 32-bit IO_support flag to 1 > HDIO_SET_32BIT failed: Invalid argument > IO_support = 0 (default 16-bit)
Huh. Stuck at 16-bit? Bleh. Maybe there's an option you can pass to the SATA driver for 32-bit support? [Not as simple as it sounds, as the driver is likely loaded from the ramdisk/ramfs image.] The box you have running MythTV is very beefy; certainly more than would be required for only one video stream. I assumed you were having some type of occasional video glitch that prompted you to look at the system load. If everything is working fine but the system load is 1.50 then if it were me I'd ignore it (because of the reasons that Sean and Mike eloquently explained). I.E. if it 'aint broke, don't fix it. Last I read the MythTV docs they had specific recommendations for filesystem choice and settings to optimize for speed and large file support; I'm assuming you've gleaned through those already, but have a look if not. I'm also guessing that your motherboard has an onboard raid controller and that you're already using it. If not, that can help performance some if you can get that working. [I'm NOT suggesting using RAID, just suggesting using the raid CONTROLLER.] Time for me to leave for tonight's meeting. -- Chris -- Chris Knadle [EMAIL PROTECTED] _______________________________________________ Mid-Hudson Valley Linux Users Group http://mhvlug.org http://mhvlug.org/cgi-bin/mailman/listinfo/mhvlug Upcoming Meetings (6pm - 8pm) MHVLS Auditorium Dec 5 - Open Source Show and Tell Jan 2 - TBD Feb 6 - DBUS Mar 5 - Setting up a platform-independent home/small office network using Linux
