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tools/virtio: make vringh_test use inbuf/outbuf.

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As expected, the simplified accessors are faster.

for i in `seq 50`; do /usr/bin/time -f 'Wall time:%e' ./vringh_test --indirect --eventidx --parallel --fast-vringh; done 2>&1 | stats --trim-outliers:

Before:
	Using CPUS 0 and 3
	Guest: notified 0, pinged 39062-39063(39063)
	Host: notified 39062-39063(39063), pinged 0
	Wall time:1.760000-2.220000(1.789167)

After:
	Using CPUS 0 and 3
	Guest: notified 0, pinged 39037-39063(39062)
	Host: notified 39037-39063(39062), pinged 0
	Wall time:1.640000-1.810000(1.676875)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-03-20 15:44:26 +10:30
parent 282edb3649
commit e538ebaf78
2 changed files with 14 additions and 4 deletions
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10
tools/virtio/linux/virtio.h
View file

@ -63,6 +63,16 @@ int virtqueue_add_sgs(struct virtqueue *vq,
void *data,
gfp_t gfp);
int virtqueue_add_outbuf(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
gfp_t gfp);
int virtqueue_add_inbuf(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
gfp_t gfp);
void virtqueue_kick(struct virtqueue *vq);
void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);

8
tools/virtio/vringh_test.c
View file

@ -369,11 +369,11 @@ static int parallel_test(unsigned long features,
* user addr */
__kmalloc_fake = indirects + (xfers % RINGSIZE) * 4;
if (output)
err = virtqueue_add_buf(vq, sg, num_sg, 0, dbuf,
GFP_KERNEL);
err = virtqueue_add_outbuf(vq, sg, num_sg, dbuf,
GFP_KERNEL);
else
err = virtqueue_add_buf(vq, sg, 0, num_sg, dbuf,
GFP_KERNEL);
err = virtqueue_add_inbuf(vq, sg, num_sg,
dbuf, GFP_KERNEL);
if (err == -ENOSPC) {
if (!virtqueue_enable_cb_delayed(vq))