Re: kernel/printk.c: increasing the buffer size to capture devfsd debug messages.

[Robert Read]

On Wed, Feb 21, 2001 at 02:30:08AM +0900, Ishikawa wrote:
> 
> Has anyone tried 128K buffer size in kernel/printk.c
> and still have the kernel boot (without
> hard to notice memory corruption problems  and other subtle bugs)?
> Any hints and tips will be appreciated.

I have used 128k and larger buffer sizes, and I just noticed this
fragment in the RedHat Tux Webserver patch.  It creates a 2MB buffer:

--- linux/kernel/printk.c.orig  Sun Jan 28 20:24:13 2001
+++ linux/kernel/printk.c       Wed Jan 31 23:21:25 2001
@@ -22,7 +22,11 @@
 
 #include <asm/uaccess.h>
 
-#define LOG_BUF_LEN    (16384)
+#if CONFIG_TUX_DEBUG
+# define LOG_BUF_LEN   (16384*128)
+#else
+# define LOG_BUF_LEN   (16384)
+#endif
 #define LOG_BUF_MASK   (LOG_BUF_LEN-1)
 
 static char buf[1024];