| 1 |
Michael Hampicke writes: |
| 2 |
|
| 3 |
> Am 07.05.2012 18:26, schrieb Volker Armin Hemmann: |
| 4 |
> > Am Montag, 7. Mai 2012, 14:41:34 schrieb Alex Schuster: |
| 5 |
> >> Some while ago, I wrote: |
| 6 |
> >> |
| 7 |
> >> [ |
| 8 |
> >> mplayer stutters when I/O is going on, even hangs for seconds when I |
| 9 |
> >> do a dd if=/dev/zero of=somefile bs=1M |
| 10 |
> >> ] |
| 11 |
[...] |
| 12 |
> >> But now I found another solution: NOT USING KDE. |
| 13 |
> >> |
| 14 |
> >> When X crashed (trying to make the old Unreal game play), I fired up |
| 15 |
> >> another window manager, and when I played a video in there, there |
| 16 |
> >> was no problem at all. So, I have another workaround. |
| 17 |
> >> |
| 18 |
> >> But does anyone have an idea, why running KDE is the problem? |
| 19 |
> >> Disabling desktop effects does not help. |
| 20 |
> > |
| 21 |
> > nepomuk/virtuoso running in the background |
| 22 |
> > |
| 23 |
> > whenever you have more than 1 process doing IO linux sucks ass. |
| 24 |
> > |
| 25 |
> > Now, you write to a partition, nepomuk tries to index it (1 read) and |
| 26 |
> > your player reading the video file (2nd read). Interactivity is shot. |
| 27 |
> > |
| 28 |
> > Pause/kill nepomuk and look if it helps. |
| 29 |
|
| 30 |
Nice shot, but this cannot be the problem. Sorry, now that I read my post |
| 31 |
again I see I did not mention that I _still_ have KDE running all the |
| 32 |
time, doing whatever it does. I only need to play the videos outside in a |
| 33 |
window manager I have running in parallel. |
| 34 |
And the output of my dd action goes to another partition anyway, which is |
| 35 |
not being indexed. I have 280,000 files indexed, a plain locate gives |
| 36 |
nearly ten times as much. |
| 37 |
Virtuoso has been a big pain in the past indeed. So I had it disabled |
| 38 |
until KDE 4.8 I think. It does some indexing now when I log in, and it is |
| 39 |
still doing so 8 hours after I logged in the last time, but I do not |
| 40 |
notice this much, since KDE 4.8. Whether it affects my video playback I'm |
| 41 |
not so sure, but I have the playback problems even when it is not running |
| 42 |
- there's too much stuff going on all the time. |
| 43 |
|
| 44 |
> > For me the worst case is: writing lots of files on a usb device - |
| 45 |
> > sucks everywhere, even on a vt. |
| 46 |
|
| 47 |
Indeed. But should this affect an mplayer using a huge cache? |
| 48 |
Does it also suck when you are writing with cp, using ionice -c 3? |
| 49 |
|
| 50 |
> Maybe changing the kernel io scheduler will help? |
| 51 |
> |
| 52 |
> # /usr/src/linux/Documentation/block/switching-sched.txt |
| 53 |
> # /usr/src/linux/Documentation/block/deadline-iosched.txt |
| 54 |
> # /usr/src/linux/Documentation/block/cfq-iosched.txt |
| 55 |
|
| 56 |
Nope. I just tried noop and deadline (cfq is my default) and did not see |
| 57 |
much of a difference. |
| 58 |
|
| 59 |
Wonko |
Archives