[Qemu-devel] [PATCH 5/6] kvm: qemu: improve scsi dma speed by increasing the dma buffer size

[Anthony Liguori]

From: Avi Kivity <address@hidden>

taken from Xen 17267:f4a92f0db20f, original patch by Samuel Thibault.

Signed-off-by: Avi Kivity <address@hidden>
Signed-off-by: Anthony Liguori <address@hidden>

diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 44462d4..fc7fbe0 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -34,7 +34,7 @@ do { fprintf(stderr, "scsi-disk: " fmt , ##args); } while (0)
 #define SENSE_HARDWARE_ERROR  4
 #define SENSE_ILLEGAL_REQUEST 5
 
-#define SCSI_DMA_BUF_SIZE    65536
+#define SCSI_DMA_BUF_SIZE    131072
 
 typedef struct SCSIRequest {
     SCSIDeviceState *dev;