netdev - Re: [PATCH 2/2] vhost: re-introducing metadata acceleration through kernel virtual address

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Date:   Mon, 9 Sep 2019 10:30:20 +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,
        jgg@...lanox.com, aarcange@...hat.com, jglisse@...hat.com,
        linux-mm@...ck.org,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Christoph Hellwig <hch@...radead.org>,
        David Miller <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH 2/2] vhost: re-introducing metadata acceleration through
 kernel virtual address


On 2019/9/9 上午10:18, Jason Wang wrote:
>>>
>>> On a elder CPU Sandy Bridge without SMAP support. TX PPS doesn't see
>>> any difference.
>> Why is not Kaby Lake with SMAP off the same as Sandy Bridge?
>
>
> I don't know, I guess it was because the atomic is l 


Sorry, I meant atomic costs less for Kaby Lake.

Thanks