linux-kernel - Re: [RFC PATCH V3 0/6] vhost: accelerate metadata access

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Date:   Sun, 5 May 2019 17:20:31 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     peterx@...hat.com, aarcange@...hat.com,
        James.Bottomley@...senpartnership.com, hch@...radead.org,
        davem@...emloft.net, jglisse@...hat.com, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-parisc@...r.kernel.org,
        christophe.de.dinechin@...il.com, jrdr.linux@...il.com
Subject: Re: [RFC PATCH V3 0/6] vhost: accelerate metadata access


On 2019/4/23 下午1:54, 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 direct
> mapping and co-opreate VM management with MMU notifiers.
>
> Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see
> obvious improvement.


Ping. Comments are more than welcomed.

Thanks