[dpdk-dev] [PATCH v2 0/4] vhost: add missing barriers, move prefetching
maxime.coquelin at redhat.com
Thu Dec 20 19:19:49 CET 2018
On 12/19/18 9:21 AM, Maxime Coquelin wrote:
> 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(-)
Applied to dpdk-next-virtio.
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