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linux_old1/tools/virtio/ringtest
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Paolo Bonzini 948a8ac296 ringtest: poll for new buffers once before updating event index 
Updating the event index has a memory barrier and causes more work
on the other side to actually signal the event.  It is unnecessary
if a new buffer has already appeared on the ring, so poll once before
doing the update.

The effect of this on the 0.9 ring implementation is pretty much
invisible, but on the new-style ring it provides a consistent 3%
performance improvement.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
 		2016-10-31 00:21:43 +02:00
..
Makefile ringtest: use link-time optimization 2016-10-31 00:21:42 +02:00
README tools/virtio/ringtest: add usage example to README 2016-06-06 13:00:11 +03:00
main.c ringtest: poll for new buffers once before updating event index 2016-10-31 00:21:43 +02:00
main.h ringtest: commonize implementation of poll_avail/poll_used 2016-10-31 00:21:43 +02:00
noring.c ringtest: commonize implementation of poll_avail/poll_used 2016-10-31 00:21:43 +02:00
ptr_ring.c ringtest: commonize implementation of poll_avail/poll_used 2016-10-31 00:21:43 +02:00
ring.c ringtest: commonize implementation of poll_avail/poll_used 2016-10-31 00:21:43 +02:00
run-on-all.sh tools/virtio/ringtest: fix run-on-all.sh to work without /dev/cpu 2016-06-06 13:00:11 +03:00
virtio_ring_0_9.c ringtest: commonize implementation of poll_avail/poll_used 2016-10-31 00:21:43 +02:00
virtio_ring_inorder.c virtio: add inorder option 2016-05-22 19:44:12 +03:00
virtio_ring_poll.c
…

README 

Partial implementation of various ring layouts, useful to tune virtio design.
Uses shared memory heavily.

Typical use:

# sh run-on-all.sh perf stat -r 10 --log-fd 1 -- ./ring