Messages in this thread | | | Subject | Re: [RFC PATCH V3 0/5] Hi: | From | Jason Wang <> | Date | Mon, 7 Jan 2019 10:19:03 +0800 |
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On 2019/1/3 上午4:47, 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
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