netdev - Re: [RFC v5 0/5] virtio: support packed ring

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Message-ID: <b19e0888-61dc-c067-0b05-fde3b5eb0902@redhat.com>
Date:   Fri, 25 May 2018 10:31:26 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     wexu@...hat.com, jfreimann@...hat.com
Subject: Re: [RFC v5 0/5] virtio: support packed ring



On 2018年05月22日 16:16, Tiwei Bie wrote:
> Hello everyone,
>
> This RFC implements packed ring support in virtio driver.
>
> Some simple functional tests have been done with Jason's
> packed ring implementation in vhost (RFC v4):
>
> https://lkml.org/lkml/2018/5/16/501
>
> Both of ping and netperf worked as expected w/ EVENT_IDX
> disabled. Ping worked as expected w/ EVENT_IDX enabled,
> but netperf didn't (A hack has been added in the driver
> to make netperf test pass in this case. The hack can be
> found by `grep -rw XXX` in the code).

Looks like this is because a bug in vhost which wrongly track 
signalled_used and may miss an interrupt. After fixing that, both side 
works like a charm.

I'm testing vIOMMU and zerocopy, and will post a new version shortly. 
(Hope it would be the last RFC version).

Thanks