Re: [patch] lowlatency-2.3.12-A0, sound, multimedia performance, etc.

Artur Skawina (skawina@geocities.com)
Tue, 27 Jul 1999 01:24:03 +0200

Ingo Molnar wrote:
>
> (and everybody else having sound problems under high load) try the
> attached patch?
>
> It dramatically reduces sound skipping here:

> +++ linux/include/asm-i386/uaccess.h Sat Jul 24 00:55:48 1999
> + if (current->need_resched) schedule(); \

this patch causes processes writing to the console to sometimes
get stuck in __generic_copy_from_user. I finally managed to
reproduce this; n_tty.c:write_chan() sets current->state to
TASK_INTERRUPTIBLE before copy_to_user gets called.
[sys_write->tty_write->write_chan->opost_block->copy_from_user]

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