From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Marvin Liu <yong.liu@intel.com>,
xiaolong.ye@intel.com, zhihong.wang@intel.com,
eperezma@redhat.com
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] vhost: remove deferred shadow update
Date: Wed, 15 Apr 2020 16:15:31 +0200 [thread overview]
Message-ID: <c45701ca-513c-e6be-3c9d-ef36a463a69a@redhat.com> (raw)
In-Reply-To: <20200401212926.74989-1-yong.liu@intel.com>
On 4/1/20 11:29 PM, Marvin Liu wrote:
> Defer shadow ring update will help overall throughput when frontend
> much slower than backend. But that is not all the cases we faced now.
> In case like ovs-dpdk + dpdk virtio user, frontend will much faster
> than backend. Frontend may not be able to collect available descs when
> shadow update is deferred. Thus will harm RFC2544 performance.
I don't understand this comment. What is the difference in term of
performance between Qemu + Virtio PMD and Virtio-User PMD, as the
datapath is the same?
> Solution is just remove deferred shadow update, which will help RFC2544
> and fix potential issue with virtio net driver.
What is the potential issue?
Maxime
next prev parent reply other threads:[~2020-04-15 14:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 21:29 Marvin Liu
2020-04-06 8:56 ` Wang, Yinan
2020-04-15 14:15 ` Maxime Coquelin [this message]
2020-04-15 14:55 ` Liu, Yong
2020-04-15 15:03 ` Maxime Coquelin
2020-04-16 0:29 ` Liu, Yong
2020-04-17 2:39 ` [dpdk-dev] [PATCH v2] vhost: fix " Marvin Liu
2020-04-17 13:29 ` Maxime Coquelin
2020-04-17 17:08 ` Maxime Coquelin
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