linux-kernel - Re: [PATCH net-next 0/6] vhost: accelerate metadata access

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Message-Id: <20190530.110730.2064393163616673523.davem@davemloft.net>
Date:   Thu, 30 May 2019 11:07:30 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, peterx@...hat.com,
        James.Bottomley@...senpartnership.com, hch@...radead.org,
        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: [PATCH net-next 0/6] vhost: accelerate metadata access

From: Jason Wang <jasowang@...hat.com>
Date: Fri, 24 May 2019 04:12:12 -0400

> 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 like SMAP. 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.

I'm still waiting for some review from mst.

If I don't see any review soon I will just wipe these changes from
patchwork as it serves no purpose to just let them rot there.

Thank you.