From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date: Mon, 2 Apr 2012 16:54:08 +0000 (+0100)
Subject: qemu-xen-traditional: use O_DIRECT to open disk images for IDE
X-Git-Tag: xen-4.2.0-rc1~14
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=1307e42a4b3c1102d75401bc0cffb4eb6c9b7a38;p=qemu-xen-4.2-testing.git

qemu-xen-traditional: use O_DIRECT to open disk images for IDE

[ Major performance fix. -iwj ]

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
---

diff --git a/xenstore.c b/xenstore.c
index 4c483e295..ac90366f0 100644
--- a/xenstore.c
+++ b/xenstore.c
@@ -643,7 +643,7 @@ void xenstore_parse_domain_config(int hvm_domid)
 	    }
             pstrcpy(bs->filename, sizeof(bs->filename), params);
 
-            flags = BDRV_O_CACHE_WB; /* snapshot and write-back */
+            flags = BDRV_O_NOCACHE;
             is_readonly = 0;
             if (pasprintf(&buf, "%s/mode", bpath) == -1)
                 continue;