Clean up event log merge code

Fix a decade-old ridiculous qsort function bug. Managed to subtract
floating-point numbers as if they were integers, leading to
manufactured time-paradoxes. That completely confuses g2, leading to
the summary disappearance of entire tracks' worth of data at high zoom
levels.

Add a manual alignment tweak parameter to elog_merge, users can
dial-out time paradoxes caused by NTP-grade clock synchronization.
The event-logger has a precision of O(100ns), whereas NTP
synchronization is O(1ms).

Change-Id: I69dedabaa314f69f9df74ec9ee66e21e6c87f703
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vlib/main.c b/src/vlib/main.c
index 55a731f16c6..a27268608f3 100644
--- a/src/vlib/main.c
+++ b/src/vlib/main.c
@@ -701,7 +701,7 @@ elog_save_buffer (vlib_main_t * vm,
 		   elog_buffer_capacity (em), chroot_file);
 
   vlib_worker_thread_barrier_sync (vm);
-  error = elog_write_file (em, chroot_file);
+  error = elog_write_file (em, chroot_file, 1 /* flush ring */ );
   vlib_worker_thread_barrier_release (vm);
   vec_free (chroot_file);
   return error;