Re: [RFC PATCH V3 0/5] Hi:

[Jason Wang]

On 2019/1/3 äå4:47, Michael S. Tsirkin wrote:
> On Sat, Dec 29, 2018 at 08:46:51PM +0800, Jason Wang wrote:
> > This series tries to access virtqueue metadata through kernel virtual
> > address instead of copy_user() friends since they had too much
> > overheads like checks, spec barriers or even hardware feature
> > toggling.
> Will review, thanks!
> One questions that comes to mind is whether it's all about bypassing
> stac/clac.  Could you please include a performance comparison with
> nosmap?

On machine without SMAP (Sandy Bridge):

Before: 4.8Mpps

After: 5.2Mpps

On machine with SMAP (Broadwell):

Before: 5.0Mpps

After: 6.1Mpps

No smap: 7.5Mpps


Thanks