mieq: Bump default queue size to 512

Based on some bugzilla scraping I did around November 2012.  Of xserver
bugs in Red Hat bugzilla with an EQ size message in the log, the
distribution looked like:

String                      | Matches
-------------------------------------
Increasing EQ size to 512   | 460
Increasing EQ size to 1024  | 52
Increasing EQ size to 2048  | 6
Increasing EQ size to 4096  | 0

Most of the "512" ones appear to be mostly harmless, some relatively
expensive path in either rendering or resource destruction simply taking
too long due to external pressures like paging or CPU contention.  So
let's raise the initial queue size, both to reduce the number of
spurious abrt reports and to drop fewer events in all but the most
pathological cases.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jasper St. Pierre <jstpierre@mecheye.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

mi/mieq.c

@@ -60,7 +60,7 @@ in this Software without prior written authorization from The Open Group.
 #endif
 
 /* Maximum size should be initial size multiplied by a power of 2 */
-#define QUEUE_INITIAL_SIZE                 256
+#define QUEUE_INITIAL_SIZE                 512
 #define QUEUE_RESERVED_SIZE                 64
 #define QUEUE_MAXIMUM_SIZE                4096
 #define QUEUE_DROP_BACKTRACE_FREQUENCY     100