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From: "Zhangjie (HZ)" <zhangjie14@huawei.com>
To: <kvm@vger.kernel.org>, Jason Wang <jasowang@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	<linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
	<liuyongan@huawei.com>, <qinchuanyu@huawei.com>
Subject: [QA-TCP] How to send tcp small packages immediately?
Date: Fri, 24 Oct 2014 15:41:17 +0800	[thread overview]
Message-ID: <544A029D.3080508@huawei.com> (raw)

Hi,

I use netperf to test the performance of small tcp package, with TCP_NODELAY set :

netperf -H 129.9.7.164 -l 100 -- -m 512 -D

Among the packages I got by tcpdump, there is not only small packages, also lost of
big ones (skb->len=65160).

IP 129.9.7.186.60840 > 129.9.7.164.34607: tcp 65160
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.186.60840 > 129.9.7.164.34607: tcp 65160
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.164.34607 > 129.9.7.186.60840: tcp 0
IP 129.9.7.186.60840 > 129.9.7.164.34607: tcp 80
IP 129.9.7.186.60840 > 129.9.7.164.34607: tcp 512
IP 129.9.7.186.60840 > 129.9.7.164.34607: tcp 512

SO, how to test small tcp packages? Including TCP_NODELAY, What else should be set?

Thanks!
-- 
Best Wishes!
Zhang Jie


             reply	other threads:[~2014-10-24  7:42 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-24  7:41 Zhangjie (HZ) [this message]
2014-10-24 15:19 ` [QA-TCP] How to send tcp small packages immediately? Rick Jones
2014-10-27  1:08   ` Zhangjie (HZ)

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