<snip> > > > > 23/09/2020 03:51, Marvin Liu: > > > Data prefetch instruction can preload data into cpu’s hierarchical > > > cache before data access. Virtualized data paths like virtio > > > utilized this feature for acceleration. Since most modern cpus have > > > support prefetch function, we can enable packet data prefetch as default. > > > > > > Signed-off-by: Marvin Liu <yong....@intel.com> > > > --- > > > +#define RTE_PMD_PACKET_PREFETCH 1 > > > > We could also remove the related #ifdefs. > > > > What can be the drawback of always enable those prefetches? > > > > Hi Thomas, > I think the potential drawback is that current prefetch location cannot > guarantee the best performance across different platforms. Then, does it make sense to enable this by default?
> Each developer has tuned the performance by adding prefetch instruction > and verified the result on himself platform. > So prefetch location is based on certain platform, also it will be hard for > developer to compare the results across platforms. > > Thanks, > Marvin
