tools/virtio: make vringh_test use inbuf/outbuf. (e538ebaf) · Commits · 戴 / test

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>

tools/virtio/linux/virtio.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -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);

tools/virtio/vringh_test.c

+4 −4

Original line number	Diff line number	Diff line
		@@ -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,
		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))

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