From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Tosatti <marcelo@kvack.org>
Subject: [PATCH] virtio-blk: allow more than one in-flight
	request
Date: Thu, 27 Mar 2008 13:29:48 -0300
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Cc: kvm-devel <kvm-devel@lists.sourceforge.net>
To: Rusty Russell <rusty@rustcorp.com.au>,
	Anthony Liguori <aliguori@us.ibm.com>
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Allow more than one in-flight request in the virtio ring. This allows
the host driver to submit requests in parallel.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>


diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 3b1a68d..5bb041f 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -30,6 +30,8 @@ struct virtio_blk
 	struct scatterlist sg[VIRTIO_MAX_SG];
 };
 
+#define VIRTIO_BLK_POOL_SIZE 32
+
 struct virtblk_req
 {
 	struct list_head list;
@@ -202,7 +204,8 @@ static int virtblk_probe(struct virtio_device *vdev)
 		goto out_free_vblk;
 	}
 
-	vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
+	vblk->pool = mempool_create_kmalloc_pool(VIRTIO_BLK_POOL_SIZE,
+                        sizeof(struct virtblk_req));
 	if (!vblk->pool) {
 		err = -ENOMEM;
 		goto out_free_vq;

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