From d4a8bb04cc7fd7dbab6501e16b2f4d8a9a92acac Mon Sep 17 00:00:00 2001

From: "Richard W.M. Jones" <rjones@redhat.com>

Date: Thu, 28 Apr 2016 22:37:04 +0100

Subject: [PATCH] launch: Don't initialize all UARTs (serial ports).

This doesn't save very much time, perhaps under 1ms, but it avoids

some useless scanning.

(cherry picked from commit d76129aa0cca856994c1a65b55dc18d2a2049d34)

---

 src/launch.c | 1 +

 1 file changed, 1 insertion(+)

diff --git a/src/launch.c b/src/launch.c

index 9f5b14f..04b0e94 100644

--- a/src/launch.c

+++ b/src/launch.c

@@ -340,6 +340,7 @@ guestfs_int_appliance_command_line (guestfs_h *g, const char *appliance_dev,

      " printk.time=1"   /* display timestamp before kernel messages */

      " cgroup_disable=memory"   /* saves us about 5 MB of RAM */

      " usbcore.nousb"           /* disable USB, only saves about 1ms */

+     " 8250.nr_uarts=1"         /* don't scan all 8250 UARTS */

      "%s"                       /* root=appliance_dev */

      " %s"                      /* selinux */

      " %s"                      /* quiet/verbose */

-- 

2.7.4