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

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Message-Id: <20190123.092412.1232153663747428685.davem@redhat.com>
Date:   Wed, 23 Jan 2019 09:24:12 -0800 (PST)
From:   David Miller <davem@...hat.com>
To:     mst@...hat.com
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()

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Wed, 23 Jan 2019 08:58:07 -0500

> On Wed, Jan 23, 2019 at 05:55:52PM +0800, 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.
>> 
>> Test shows about 24% improvement on TX PPS. It should benefit other
>> cases as well.
> 
> ok I think this addresses most comments but it's a big change and we
> just started 1.1 review so to pls give me a week to review this ok?

Ok. :)