linux-kernel - Re: [PATCH V3 00/15] Packed virtqueue support for vhost

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Message-ID: <af066030-96f1-4a8d-4864-7b6b903477a6@redhat.com>
Date:   Wed, 17 Jul 2019 20:27:28 +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,
        jfreimann@...hat.com, tiwei.bie@...el.com,
        maxime.coquelin@...hat.com
Subject: Re: [PATCH V3 00/15] Packed virtqueue support for vhost


On 2019/7/17 下午7:02, Michael S. Tsirkin wrote:
> On Wed, Jul 17, 2019 at 06:52:40AM -0400, Jason Wang wrote:
>> Hi all:
>>
>> This series implements packed virtqueues which were described
>> at [1]. In this version we try to address the performance regression
>> saw by V2. The root cause is packed virtqueue need more times of
>> userspace memory accesssing which turns out to be very
>> expensive. Thanks to the help of 7f466032dc9e ("vhost: access vq
>> metadata through kernel virtual address"), such overhead cold be
>> eliminated. So in this version, we can see about 2% improvement for
>> packed virtqueue on PPS.
> Great job, thanks!
> Pls allow a bit more review time than usual as this is a big patchset.
> Should be done by Tuesday.
> -next material anyway.


Sure, just to confirm, I think this should go for your vhost tree?.

Thanks