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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: dev@dpdk.org, chenbo.xia@intel.com, amorenoz@redhat.com
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Subject: [dpdk-dev] [PATCH 0/3] vhost: make virtqueue cache-friendly
Date: Tue, 22 Dec 2020 14:56:55 +0100	[thread overview]
Message-ID: <20201222135658.53916-1-maxime.coquelin@redhat.com> (raw)

As done for Virtio PMD, this series improves cache utilization
of the vhost_virtqueue struct by removing unused field,
make the live-migration cache dynamically allocated at
live-migration setup time and by moving fields
around so that hot fields are on the first cachelines.

With this series, The struct vhost_virtqueue size goes
from 832B (13 cachelines) down to 320B (5 cachelines).

With this series and the virtio one, I measure a gain
of up to 8% in IO loop micro-benchmark with packed
ring, and 5% with split ring.

I don't have a setup at hand to run PVP testing, but
it might be interresting to get the numbers as I
suspect the cache pressure is higher in this test as
in real use-cases.

Maxime Coquelin (3):
  vhost: remove unused Vhost virtqueue field
  vhost: move dirty logging cache out of the virtqueue
  vhost: optimize vhost virtqueue struct

 lib/librte_vhost/vhost.c      | 14 +++++++--
 lib/librte_vhost/vhost.h      | 54 +++++++++++++++++------------------
 lib/librte_vhost/vhost_user.c | 25 ++++++++++++++++
 3 files changed, 64 insertions(+), 29 deletions(-)


             reply	other threads:[~2020-12-22 13:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-22 13:56 Maxime Coquelin [this message]
2020-12-22 13:56 ` [dpdk-dev] [PATCH 1/3] vhost: remove unused Vhost virtqueue field Maxime Coquelin
2021-01-08  4:59   ` Xia, Chenbo
2020-12-22 13:56 ` [dpdk-dev] [PATCH 2/3] vhost: move dirty logging cache out of the virtqueue Maxime Coquelin
2021-01-08  7:20   ` Xia, Chenbo
2021-03-16 12:25     ` Maxime Coquelin
2020-12-22 13:56 ` [dpdk-dev] [PATCH 3/3] vhost: optimize vhost virtqueue struct Maxime Coquelin
2021-01-08  7:28   ` Xia, Chenbo
2021-01-25 17:30 ` [dpdk-dev] [PATCH 0/3] vhost: make virtqueue cache-friendly Maxime Coquelin

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