From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: "Wang, Zhihong" <zhihong.wang@intel.com>,
"yuanhan.liu@linux.intel.com" <yuanhan.liu@linux.intel.com>,
"Xie, Huawei" <huawei.xie@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "vkaplans@redhat.com" <vkaplans@redhat.com>,
"mst@redhat.com" <mst@redhat.com>,
"stephen@networkplumber.org" <stephen@networkplumber.org>
Subject: Re: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support to the TX path
Date: Fri, 14 Oct 2016 17:50:25 +0200 [thread overview]
Message-ID: <70cc3b89-d680-1519-add3-f38b228e65b5@redhat.com> (raw)
In-Reply-To: <8F6C2BD409508844A0EFC19955BE09414E7CE6D1@SHSMSX103.ccr.corp.intel.com>
On 10/14/2016 09:24 AM, Wang, Zhihong wrote:
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Maxime Coquelin
>> Sent: Tuesday, September 27, 2016 4:43 PM
>> To: yuanhan.liu@linux.intel.com; Xie, Huawei <huawei.xie@intel.com>;
>> dev@dpdk.org
>> Cc: vkaplans@redhat.com; mst@redhat.com;
>> stephen@networkplumber.org; Maxime Coquelin
>> <maxime.coquelin@redhat.com>
>> Subject: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support to
>> the TX path
>>
>> Indirect descriptors are usually supported by virtio-net devices,
>> allowing to dispatch a larger number of requests.
>>
>> When the virtio device sends a packet using indirect descriptors,
>> only one slot is used in the ring, even for large packets.
>>
>> The main effect is to improve the 0% packet loss benchmark.
>> A PVP benchmark using Moongen (64 bytes) on the TE, and testpmd
>> (fwd io for host, macswap for VM) on DUT shows a +50% gain for
>> zero loss.
>>
>> On the downside, micro-benchmark using testpmd txonly in VM and
>> rxonly on host shows a loss between 1 and 4%.i But depending on
>> the needs, feature can be disabled at VM boot time by passing
>> indirect_desc=off argument to vhost-user device in Qemu.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>
>
> Hi Maxime,
>
> Seems this patch can't with Windows virtio guest in my test.
> Have you done similar tests before?
>
> The way I test:
>
> 1. Make sure https://patchwork.codeaurora.org/patch/84339/ is applied
>
> 2. Start testpmd with iofwd between 2 vhost ports
>
> 3. Start 2 Windows guests connected to the 2 vhost ports
>
> 4. Disable firewall and assign IP to each guest using ipconfig
>
> 5. Use ping to test connectivity
>
> When I disable this patch by setting:
>
> 0ULL << VIRTIO_RING_F_INDIRECT_DESC,
>
> the connection is fine, but when I restore:
>
> 1ULL << VIRTIO_RING_F_INDIRECT_DESC,
>
> the connection is broken.
Just noticed I didn't reply to all this morning.
I sent a debug patch to Zhihong, which shows that indirect desc chaining
looks OK.
On my side, I just setup 2 Windows 2016 VMs, and confirm the issue.
I'll continue the investigation early next week.
Has anyone already tested Windows guest with vhost-net, which also has
indirect descs support?
Regards,
Maxime
next prev parent reply other threads:[~2016-10-14 15:50 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-23 8:28 [dpdk-dev] [PATCH v3] " Maxime Coquelin
2016-09-23 15:49 ` Michael S. Tsirkin
2016-09-23 18:02 ` Maxime Coquelin
2016-09-23 18:06 ` Michael S. Tsirkin
2016-09-23 18:16 ` Maxime Coquelin
2016-09-23 18:22 ` Michael S. Tsirkin
2016-09-23 20:24 ` Stephen Hemminger
2016-09-26 3:03 ` Yuanhan Liu
2016-09-26 12:25 ` Michael S. Tsirkin
2016-09-26 13:04 ` Yuanhan Liu
2016-09-27 4:15 ` Yuanhan Liu
2016-09-27 7:25 ` Maxime Coquelin
2016-09-27 8:42 ` [dpdk-dev] [PATCH v4] " Maxime Coquelin
2016-09-27 12:18 ` Yuanhan Liu
2016-10-14 7:24 ` Wang, Zhihong
2016-10-14 7:34 ` Wang, Zhihong
2016-10-14 15:50 ` Maxime Coquelin [this message]
2016-10-17 11:23 ` Maxime Coquelin
2016-10-17 13:21 ` Yuanhan Liu
2016-10-17 14:14 ` Maxime Coquelin
2016-10-27 9:00 ` Wang, Zhihong
2016-10-27 9:10 ` Maxime Coquelin
2016-10-27 9:55 ` Maxime Coquelin
2016-10-27 10:19 ` Wang, Zhihong
2016-10-28 7:32 ` Pierre Pfister (ppfister)
2016-10-28 7:58 ` Maxime Coquelin
2016-11-01 8:15 ` Yuanhan Liu
2016-11-01 9:39 ` Thomas Monjalon
2016-11-02 2:44 ` Yuanhan Liu
2016-10-27 10:33 ` Yuanhan Liu
2016-10-27 10:35 ` Maxime Coquelin
2016-10-27 10:46 ` Yuanhan Liu
2016-10-28 0:49 ` Wang, Zhihong
2016-10-28 7:42 ` Maxime Coquelin
2016-10-31 10:01 ` Wang, Zhihong
2016-11-02 10:51 ` Maxime Coquelin
2016-11-03 8:11 ` Maxime Coquelin
2016-11-04 6:18 ` Xu, Qian Q
2016-11-04 7:41 ` Maxime Coquelin
2016-11-04 7:20 ` Wang, Zhihong
2016-11-04 7:57 ` Maxime Coquelin
2016-11-04 7:59 ` Maxime Coquelin
2016-11-04 10:43 ` Wang, Zhihong
2016-11-04 11:22 ` Maxime Coquelin
2016-11-04 11:36 ` Yuanhan Liu
2016-11-04 11:39 ` Maxime Coquelin
2016-11-04 12:30 ` Wang, Zhihong
2016-11-04 12:54 ` Maxime Coquelin
2016-11-04 13:09 ` Wang, Zhihong
2016-11-08 10:51 ` Wang, Zhihong
2016-10-27 10:53 ` Maxime Coquelin
2016-10-28 6:05 ` Xu, Qian Q
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