[dpdk-stable] [PATCH v2 0/4] vhost: add missing barriers, move prefetching
Tiwei Bie
tiwei.bie at intel.com
Thu Dec 20 05:39:10 CET 2018
On Wed, Dec 19, 2018 at 09:21:09AM +0100, 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(-)
Acked-by: Tiwei Bie <tiwei.bie at intel.com>
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