Am Montag, 7. Mai 2012, 14:41:34 schrieb Alex Schuster: > Some while ago, I wrote: > > [ > mplayer stutters when I/O is going on, even hangs for seconds when I do a > dd if=/dev/zero of=somefile bs=1M > ] > > > Urs Schutz writes: > > > Just an idea: Is the disk OK? Replace /dev/sda with your > > > disk... > > [...] > > > > I had a bad disk here, which resulted in slow IO, but not > > > complete failure. Smart detected this immediately. Sorry, > > > I do not know how to check disks with LVM. > > > > Didn't you get errors in yslog then? > > > > I also thought about swapping the system drive - I have a larger backup > > drive, with nearly identical logical volumes on it, where I make > > backups with rdiffbackup. So even the content is identical, except for > > an additional rdiff-backup directory containing the increments. So all > > I have to do is to echange the two volume group names, reboot, and the > > system will run from the other drive. But I very much doubt this will > > help, transfer speed looks okay to me, around 100 MB/s with dd. > > I did it in another way. I created a large file system (LVM) on my 2nd > drive, copied /, /usr, /var, /opt and /home over. My whole system is > encrypted, but I omitted this, just to make sure this is not the > bottleneck. > > Alas, no change. Another thing I tried was to change the SATA mode in my > BIOS from AHCI to whatever the other option is. This did not help either. > > Now this is really annoying. I watch small clips mostly, and can live > with that, and when I want to watch stuff with others, I copy the file to > tmpfs, which seems to help a lot. > > But now I found another solution: NOT USING KDE. > > When X crashed (trying to make the old Unreal game play), I fired up > another window manager, and when I played a video in there, there was no > problem at all. So, I have another workaround. > > But does anyone have an idea, why running KDE is the problem? Disabling > desktop effects does not help.
nepomuk/virtuoso running in the background whenever you have more than 1 process doing IO linux sucks ass. Now, you write to a partition, nepomuk tries to index it (1 read) and your player reading the video file (2nd read). Interactivity is shot. Pause/kill nepomuk and look if it helps. For me the worst case is: writing lots of files on a usb device - sucks everywhere, even on a vt. -- #163933
