On Tue, 2021-03-23 at 11:30 +0100, David Marchand wrote: > On Tue, Mar 23, 2021 at 10:02 AM Maxime Coquelin > <maxime.coque...@redhat.com> wrote: > > > > 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. > > > > Changes in v4: > > ============== > > - Fix missing changes to boolean (Chenbo) > > > > For the series, > Reviewed-by: David Marchand <david.march...@redhat.com> > > Merci ! > >
Tested this in a PVP setup on ARM, giving a slight improvement in performance. For the series: Tested-by: Balazs Nemeth <bnem...@redhat.com>
