From: Richard Jones <rjones@redhat.com>
Date: Mon, 8 Feb 2010 10:18:31 +0000 (+0000)
Subject: Make virtio block driver be the default for the appliance.
X-Git-Tag: 1.0.84~13
X-Git-Url: http://git.annexia.org/?a=commitdiff_plain;h=6c97a65ce768b357a1481cde0533d4cf0b8b931c;p=libguestfs.git

Make virtio block driver be the default for the appliance.

Previously this caused a serious performance regression,
but we believe this is now fixed:
https://bugzilla.redhat.com/show_bug.cgi?id=509383
---

diff --git a/configure.ac b/configure.ac
index e40a042..2fd83fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -227,13 +227,13 @@ fi
 dnl Set drive interface used by the guestfs_add_drive{,_ro} calls
 dnl ('-drive ...,if=...' option to qemu).
 dnl
-dnl NB. We will change the default in future to virtio, but at the
-dnl moment this causes a performance problem, RHBZ#509383.
+dnl If you encounter performance problems with virtio (RHBZ#509383)
+dnl then try '--with-drive-if=ide'.
 AC_ARG_WITH([drive-if],
         [AS_HELP_STRING([--with-drive-if],
-          [set default driver (ide|scsi|virtio) @<:@default=ide@:>@])],
+          [set default driver (ide|scsi|virtio) @<:@default=virtio@:>@])],
         [],
-        [with_drive_if=ide])
+        [with_drive_if=virtio])
 AC_DEFINE_UNQUOTED([DRIVE_IF],["$with_drive_if"],[Default drive interface.])
 
 dnl Set interface used by the network.  Normally you should