From: "Xu, Qian Q" <qian.q.xu@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
Yuanhan Liu <yuanhan.liu@linux.intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"vkaplans@redhat.com" <vkaplans@redhat.com>,
"mst@redhat.com" <mst@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support to the TX path
Date: Fri, 28 Oct 2016 06:05:07 +0000 [thread overview]
Message-ID: <82F45D86ADE5454A95A89742C8D1410E3922F793@shsmsx102.ccr.corp.intel.com> (raw)
In-Reply-To: <ba08f796-8a0e-85c9-ad75-62a782e6249f@redhat.com>
In my BDW-EP platform(similar to HSW), I can also see the performance drop. So what's the next step now?
Intel CPU GEN:
SNB-->IVB--->HSW-->BDW-EP
-----Original Message-----
From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Maxime Coquelin
Sent: Thursday, October 27, 2016 6:53 PM
To: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Cc: mst@redhat.com; dev@dpdk.org; vkaplans@redhat.com
Subject: Re: [dpdk-dev] [PATCH v4] vhost: Add indirect descriptors support to the TX path
On 10/27/2016 12:33 PM, Yuanhan Liu wrote:
> On Thu, Oct 27, 2016 at 11:10:34AM +0200, Maxime Coquelin wrote:
>> Hi Zhihong,
>>
>> On 10/27/2016 11:00 AM, Wang, Zhihong wrote:
>>> Hi Maxime,
>>>
>>> Seems indirect desc feature is causing serious performance
>>> degradation on Haswell platform, about 20% drop for both mrg=on and
>>> mrg=off (--txqflags=0xf00, non-vector version), both iofwd and
>>> macfwd.
>> I tested PVP (with macswap on guest) and Txonly/Rxonly on an Ivy
>> Bridge platform, and didn't faced such a drop.
>
> I was actually wondering that may be the cause. I tested it with my
> IvyBridge server as well, I saw no drop.
Sorry, mine is a SandyBridge, not IvyBridge.
prev parent reply other threads:[~2016-10-28 6:05 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
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 [this message]
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