[dpdk-dev] [PATCH v2 0/4] vhost: add missing barriers, move prefetching
maxime.coquelin at redhat.com
Wed Dec 19 09:21:09 CET 2018
This series adds missing read barriers after reading avail index
for split ring and desc flags for packed ring.
Also, it turns out that some descriptors prefetching are either
badly placed, or useless, last part of the series fixes that.
With the series applied, I get between 0 and 4% gain depending
on the benchmark (testpmd txonly/rxonly/io).
Thanks to Jason for reporting the missing read barriers.
Changes since v1:
- Drop volatile removal patch (Ilya)
- Improve commit messages for RMB patches (Ilya)
Maxime Coquelin (4):
vhost: enforce avail index and desc read ordering
vhost: enforce desc flags and content read ordering
vhost: prefetch descriptor after the read barrier
vhost: remove useless prefetch for packed ring descriptor
lib/librte_vhost/virtio_net.c | 27 ++++++++++++++++++++++-----
1 file changed, 22 insertions(+), 5 deletions(-)
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