From: Young Koh <young.koh@gmail.com>
To: Nuutti Kotivuori <naked@iki.fi>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Re: tun/tap network throughput problem
Date: Tue, 8 Mar 2005 13:51:19 -0500 [thread overview]
Message-ID: <3524bf1f05030810517057e99d@mail.gmail.com> (raw)
In-Reply-To: <87u0nm2fow.fsf@aka.i.naked.iki.fi>
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
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next prev parent reply other threads:[~2005-03-08 18:51 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-07 20:56 [uml-devel] tun/tap network throughput problem Young Koh
2005-03-08 11:27 ` [uml-devel] " Nuutti Kotivuori
2005-03-08 16:42 ` Young Koh
2005-03-08 17:46 ` Nuutti Kotivuori
2005-03-08 18:51 ` Young Koh [this message]
2005-03-09 9:25 ` Nuutti Kotivuori
2005-03-09 11:48 ` Nuutti Kotivuori
2005-03-10 17:39 ` Rob Landley
2005-03-09 19:29 ` [uml-devel] " Blaisorblade
2005-03-09 21:46 ` Young Koh
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