Hello lkml!
Im currently testing 2.6.19-rc5-mm1. Everything works really fine except the
little wart with bad multimedia interactivity with a kernel compiling in the
background. So I tried to narrow it down as much
as possible.
I did several find's,dd's and cats in parrallel and watched four instances of
glxgears and also played a little enemy-territory. The interactivity was very
good, in fact no loss of interactivity at all. This was contrary to what I
believed the whole time. The loss of interactivity has nothing to do with
heavy I/O. In fact it happens only when I run a task which is I/O and CPU
heavy at the same time. That means a single kernel compile (with -j1) is able
to harm interactivity with glxgears and enemy-territory, but fully loading my
three disks does no harm at all.
So I tried to nice the make and see what happens:
nice 5 make -j4: Seems to make no difference. Heavy stuttering in glxgears and
et
nice 10 make -j4: Somewhat better but still unusable with et
everything above nice 15 is usable. nice 19 has full interactivity, that means
you can't make out a difference between no load and kernel compile while
playing enemy-territory.
I suspect that it has something to do with the priority boost for I/O hogs.
But if this is a "general" scheduler problem, then why aren't more people
complaining about this?
-Christian
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