From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1D8jnf-0004w2-PU for user-mode-linux-devel@lists.sourceforge.net; Tue, 08 Mar 2005 10:51:23 -0800 Received: from rproxy.gmail.com ([64.233.170.205]) by sc8-sf-mx1.sourceforge.net with esmtp (Exim 4.41) id 1D8jne-0005N2-Dp for user-mode-linux-devel@lists.sourceforge.net; Tue, 08 Mar 2005 10:51:23 -0800 Received: by rproxy.gmail.com with SMTP id z35so229205rne for ; Tue, 08 Mar 2005 10:51:19 -0800 (PST) Message-ID: <3524bf1f05030810517057e99d@mail.gmail.com> From: Young Koh Reply-To: Young Koh Subject: Re: [uml-devel] Re: tun/tap network throughput problem In-Reply-To: <87u0nm2fow.fsf@aka.i.naked.iki.fi> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <3524bf1f05030712562d547e1c@mail.gmail.com> <87psya4btv.fsf@aka.i.naked.iki.fi> <3524bf1f050308084246dc9341@mail.gmail.com> <87u0nm2fow.fsf@aka.i.naked.iki.fi> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Tue, 8 Mar 2005 13:51:19 -0500 To: Nuutti Kotivuori Cc: user-mode-linux-devel@lists.sourceforge.net Hi, > In general, there's nothing to limit how many packets get queued to > the interface queue - if something sends a million packets, that is > how many packets are queued to the interface. However, for TCP, there interesting. then, the UDP sending rate should be solely determined by system performance regardless of what kind of the network interface used, cause the rate will be determined by how fast the application enqueues packets to the device queue, which is an internal data structure in the kernel, right? when i measured UDP sending rate in the host machine, it was about 650Mbits/s. that means the throughput of data transfer from an application to the kernel internal structure is only 650Mbits/s? but, when i measured UDP sending rate with loopback device (sending packets to 127.0.0.1), it was about 5,000Mbits/s, which is a lot faster. should they, i mean, the sending rates for eth0 and lo, be the same? (maybe lo uses special queuing mechanism?) thank you very much! -Young ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel