linux

History

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