tools/virtio/ringtest: add usage example to README

Having typical usage example in the README file is more convinient than in
the git history...

Signed-off-by: Mike Rapoport <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
This commit is contained in:
Mike Rapoport 2016-05-04 09:12:55 +03:00 • committed by Michael S. Tsirkin
commit 3b220cf867

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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