linux-kernel - Re: [RFC PATCH V2 0/8] Packed ring for vhost

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Message-ID: <1e5ad820-f11a-8208-d4c0-5d871adddb9e@redhat.com>
Date:   Tue, 27 Mar 2018 11:33:38 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        kvm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH V2 0/8] Packed ring for vhost



On 2018年03月27日 03:01, Konrad Rzeszutek Wilk wrote:
> On Mon, Mar 26, 2018 at 11:38:45AM +0800, Jason Wang wrote:
>> Hi all:
>>
>> This RFC implement packed ring layout. The code were tested with pmd
>> implement by Jens at
>> http://dpdk.org/ml/archives/dev/2018-January/089417.html. Minor change
>> was needed for pmd codes to kick virtqueue since it assumes a busy
>> polling backend.
>>
>> Test were done between localhost and guest. Testpmd (rxonly) in guest
>> reports 2.4Mpps. Testpmd (txonly) repots about 2.1Mpps.
> And how does it compare to older ring layout?
>

No obvious difference.

Vhost itself becomes a bottleneck. I plan to do more aggressive batching 
like dpdk on top.

Thanks