[linux-audio-dev] Re: [linux-audio-user] 2.6.8-rc1-mm1 [and alsa xrun debugging]

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Subject: [linux-audio-dev] Re: [linux-audio-user] 2.6.8-rc1-mm1 [and alsa xrun debugging]
From: Lee Revell (rlrevell_AT_joe-job.com)
Date: Fri Jul 16 2004 - 23:16:03 EEST


On Fri, 2004-07-16 at 10:25, Florian Schmidt wrote:
> after reading lee's email i had to try this kernel.. so i went over to www.de.kernel.org, grabbed 2.6.8-rc1 and patched it up with this patch:
>
> http://www.ussg.iu.edu/hypermail/linux/kernel/0407.1/1453.html
>
> On first sight it looks very good. many of the sporadic xruns i experienced
> with jack in RT mode are gone. even a "find /" parallel to a "make bzImage"
> seems not to provoke any xruns [i use ext3]. But: i use fluxbox and it supports
> desktop wheeling [switching desktop via scrollwheel - very handy] and doing this
> excessively and rapidly provokes xruns easily. Also starting mozilla just provoked
> an xrun..

Try the included patch. Andrew Morton suggested this, and it works
great for me, but it is not in -mm1.

Lee

--- drivers/char/tty_io.c_orig 2004-07-16 16:10:11.000000000 -0400
+++ drivers/char/tty_io.c 2004-07-16 16:10:31.000000000 -0400
@@ -679,17 +679,13 @@
                return -ERESTARTSYS;
        }
        if ( test_bit(TTY_NO_WRITE_SPLIT, &tty->flags) ) {
- lock_kernel();
                written = write(tty, file, buf, count);
- unlock_kernel();
        } else {
                for (;;) {
                        unsigned long size = max((unsigned long)PAGE_SIZE*2, 16384UL);
                        if (size > count)
                                size = count;
- lock_kernel();
                        ret = write(tty, file, buf, size);
- unlock_kernel();
                        if (ret <= 0)
                                break;
                        written += ret;


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