Re: [patch] voluntary-preempt-2.6.8-rc3-O4

Lee Revell
2004-08-10T16:03:21Z

On Tue, 2004-08-10 at 08:40, Ingo Molnar wrote:

> it's a 10 msec latency that got measured, for a single page copy (!) -
> if it's memory latency then it must be something really bad...
>

Here's another one that I have seen a few times.

(gnome-terminal/850): 15487us non-preemptible critical section violated 1100 us preempt threshold starting at add_wait_queue+0x15/0x50 and ending at add_wait_queue+0x2c/0x50
[<c0106717>] dump_stack+0x17/0x20
[<c0113eec>] dec_preempt_count+0x3c/0x50
[<c011406c>] add_wait_queue+0x2c/0x50
[<c01e334d>] normal_poll+0x3d/0x177
[<c01df281>] tty_poll+0x61/0x80
[<c015f0a1>] do_pollfd+0x91/0xa0
[<c015f10f>] do_poll+0x5f/0xc0
[<c015f2a1>] sys_poll+0x131/0x220
[<c01060b7>] syscall_call+0x7/0xb
ALSA /home/rlrevell/cvs/alsa/alsa-driver/alsa-kernel/core/pcm_lib.c:139: XRUN: pcmC0D2c
[<c0106717>] dump_stack+0x17/0x20
[<de93d64b>] snd_pcm_period_elapsed+0x27b/0x3e0 [snd_pcm]
[<de9791d1>] snd_emu10k1_interrupt+0xd1/0x3c0 [snd_emu10k1]
[<c011a7d3>] generic_handle_IRQ_event+0x33/0x60
[<c01079c2>] do_IRQ+0xb2/0x180
[<c01062d8>] common_interrupt+0x18/0x20
[<c015f0a1>] do_pollfd+0x91/0xa0
[<c015f10f>] do_poll+0x5f/0xc0
[<c015f2a1>] sys_poll+0x131/0x220
[<c01060b7>] syscall_call+0x7/0xb

Lee