From: Asias He <asias.hejun@gmail.com>
Date: Mon, 4 Jun 2012 15:10:04 +0000 (+0800)
Subject: kvm tools: Increase AIO_MAX to 256
X-Git-Tag: next-20120724~32^2~82^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b9137f616884386484319f33cd6bec2839486233;p=karo-tx-linux.git

kvm tools: Increase AIO_MAX to 256

The queue size for virtio_blk is 256 and AIO_MAX is 32, we might be
short of available aio events if guest issues > 32 requests
simultaneously. Following error is observed when guest running stressed
I/O workload.

  Info: disk_image__read error: total=-11

To fix this, let's increase the aio events limit.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/tools/kvm/disk/core.c b/tools/kvm/disk/core.c
index 2b482c6a5184..2739dcdb6f8a 100644
--- a/tools/kvm/disk/core.c
+++ b/tools/kvm/disk/core.c
@@ -6,7 +6,7 @@
 #include <sys/eventfd.h>
 #include <sys/poll.h>
 
-#define AIO_MAX 32
+#define AIO_MAX 256
 
 int debug_iodelay;