netdev - Re: [RFC PATCH V3 0/5] Hi:

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Message-ID: <0efd115a-a7fb-54bf-5376-59d047a15fd3@redhat.com>
Date:   Mon, 7 Jan 2019 10:19:03 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net
Subject: Re: [RFC PATCH V3 0/5] Hi:


On 2019/1/3 上午4:47, Michael S. Tsirkin wrote:
> On Sat, Dec 29, 2018 at 08:46:51PM +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.
> Will review, thanks!
> One questions that comes to mind is whether it's all about bypassing
> stac/clac.  Could you please include a performance comparison with
> nosmap?
>

On machine without SMAP (Sandy Bridge):

Before: 4.8Mpps

After: 5.2Mpps

On machine with SMAP (Broadwell):

Before: 5.0Mpps

After: 6.1Mpps

No smap: 7.5Mpps


Thanks