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

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Message-ID: <20190126193126-mutt-send-email-mst@kernel.org>
Date:   Sat, 26 Jan 2019 19:31:38 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     David Miller <davem@...emloft.net>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH net-next V4 0/5] vhost: accelerate metadata access
 through vmap()

On Sat, Jan 26, 2019 at 02:37:08PM -0800, David Miller wrote:
> 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.


Add dirty tracking.

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