Messages in this thread | | | Subject | Re: [RFC PATCH V2 0/5] vhost: accelerate metadata access through vmap() | From | Jason Wang <> | Date | Mon, 11 Mar 2019 15:13:17 +0800 |
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On 2019/3/8 下午10:12, Christoph Hellwig wrote: > On Wed, Mar 06, 2019 at 02:18:07AM -0500, 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. This is done through setup kernel address through vmap() and >> resigter MMU notifier for invalidation. >> >> Test shows about 24% improvement on TX PPS. TCP_STREAM doesn't see >> obvious improvement. > How is this going to work for CPUs with virtually tagged caches?
Anything different that you worry? I can have a test but do you know any archs that use virtual tag cache?
Thanks
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