linux-kernel - Re: [PATCH net-next 0/6] vhost: accelerate metadata access

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Date:   Mon, 10 Jun 2019 11:50:45 +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,
        peterx@...hat.com, James.Bottomley@...senpartnership.com,
        hch@...radead.org, davem@...emloft.net, jglisse@...hat.com,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-parisc@...r.kernel.org, christophe.de.dinechin@...il.com,
        jrdr.linux@...il.com
Subject: Re: [PATCH net-next 0/6] vhost: accelerate metadata access


On 2019/6/6 上午4:27, Michael S. Tsirkin wrote:
> On Fri, May 24, 2019 at 04:12:12AM -0400, Jason Wang wrote:
>> Hi:
>>
>> 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 like SMAP. This is done through setup kernel address through
>> direct mapping and co-opreate VM management with MMU notifiers.
>>
>> Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see
>> obvious improvement.
>>
>> Thanks
> Thanks this is queued for next.
>
> Did you want to rebase and repost packed ring support on top?
> IIUC it's on par with split ring with these patches.
>
>

Yes, it's on the way.

Thanks