netdev - Re: [PATCH net-next V4 0/5] vhost: accelerate metadata access through vmap()

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Date:   Sat, 26 Jan 2019 14:37:08 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, mst@...hat.com, kvm@...r.kernel.org
Subject: Re: [PATCH net-next V4 0/5] vhost: accelerate metadata access
 through vmap()

From: Jason Wang <jasowang@...hat.com>
Date: Wed, 23 Jan 2019 17:55:52 +0800

> 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.
> 
> Test shows about 24% improvement on TX PPS. It should benefit other
> cases as well.

I've read over the discussion of patch #5 a few times.

And it seems to me that, at a minimum, a few things still need to
be resolved:

1) More perf data added to commit message.

2) Whether invalidate_range_start() and invalidate_range_end() must
   be paired.

Etc.  So I am marking this series "Changes Requested".