21 Jul
2004
21 Jul
'04
4:17 a.m.
On Wed, 2004-07-21 at 01:30, Ingo Molnar wrote:
* Andrew Morton <akpm(a)osdl.org> wrote:
no, it's the ps2 driver that is sick. The ps2 keyboard driver is one of
the few places that busy-polls for IRQ completion from within a tasklet
context for things like led switching (yuck) - this can cause many
millisecs delays on all boards i tried.
I can also add that La Monte H. P. Yarroll's patch to daemonize softirqs
seems to provide major improvements in latency (does not help this
problem of course). There has been at least one other patch posted to
LKML that that does the same thing. Will this feature be in the kernel
anytime soon?
Lee
discovered I can reliably produce a large XRUN by toggling Caps Lock,
Scroll Lock, or Num Lock. This is with 2.6.8-rc1-mm1 + voluntary
preempt
That's odd. I wonder if the hardware is sick. What is the duration is the
underrun? The info you sent didn't include that.