netdev - thoughts stac/clac and get user for vhost

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Message-ID: <20181225113301-mutt-send-email-mst@kernel.org>
Date:   Tue, 25 Dec 2018 11:41:13 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     netdev@...r.kernel.org
Subject: thoughts stac/clac and get user for vhost

Hi!
I was just wondering: packed ring batches things naturally.
E.g.

user_access_begin
check descriptor valid
smp_rmb
copy descriptor
user_access_end

So packed layout should show the gain with this approach.
That could be motivation enough to finally enable vhost packed ring
support.

Thoughts?

-- 
MST