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* [dpdk-dev] [PATCH 0/3] vhost: make virtqueue cache-friendly
@ 2020-12-22 13:56 Maxime Coquelin
  2020-12-22 13:56 ` [dpdk-dev] [PATCH 1/3] vhost: remove unused Vhost virtqueue field Maxime Coquelin
                   ` (3 more replies)
  0 siblings, 4 replies; 9+ messages in thread
From: Maxime Coquelin @ 2020-12-22 13:56 UTC (permalink / raw)
  To: dev, chenbo.xia, amorenoz; +Cc: Maxime Coquelin

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(-)

-- 
2.29.2


^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2021-03-16 12:25 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-22 13:56 [dpdk-dev] [PATCH 0/3] vhost: make virtqueue cache-friendly Maxime Coquelin
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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