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Date: Fri, 20 Sep 2013 17:21:23 -0000
From: Vincent Autefage <1228285@bugs.launchpad.net>
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Subject: [Qemu-devel] [Bug 1228285] [NEW] e1000 nic TCP performances
Reply-To: Bug 1228285 <1228285@bugs.launchpad.net>
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To: qemu-devel@nongnu.org

Public bug reported:

Hi,

Here is the context :

$ qemu -name A -m 1024 -net nic vlan=3D0,model=3De1000 -net socket,vlan=3D0=
,listen=3D127.0.0.1:7000
$ qemu -name B -m 1024 -net nic vlan=3D0,model=3De1000 -net socket,vlan=3D0=
,connect=3D127.0.0.1:7000

The bandwidth is really tiny :

    . Iperf3 reports about 30 Mb/sec
    . NetPerf reports about 50 Mb/sec


With UDP sockets, there is no problem at all :

    . Iperf3 reports about 1 Gb/sec
    . NetPerf reports about 950 Mb/sec


I've noticed this fact only with the e1000 NIC, not with others (rtl8139,vi=
rtio, etc.)
I've used the main GIT version of QEMU.


Thanks in advance.

See you,
VInce

** Affects: qemu
     Importance: Undecided
         Status: New

-- =

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https://bugs.launchpad.net/bugs/1228285

Title:
  e1000 nic TCP performances

Status in QEMU:
  New

Bug description:
  Hi,

  Here is the context :

  $ qemu -name A -m 1024 -net nic vlan=3D0,model=3De1000 -net socket,vlan=
=3D0,listen=3D127.0.0.1:7000
  $ qemu -name B -m 1024 -net nic vlan=3D0,model=3De1000 -net socket,vlan=
=3D0,connect=3D127.0.0.1:7000

  The bandwidth is really tiny :

      . Iperf3 reports about 30 Mb/sec
      . NetPerf reports about 50 Mb/sec

  =

  With UDP sockets, there is no problem at all :

      . Iperf3 reports about 1 Gb/sec
      . NetPerf reports about 950 Mb/sec

  =

  I've noticed this fact only with the e1000 NIC, not with others (rtl8139,=
virtio, etc.)
  I've used the main GIT version of QEMU.

  =

  Thanks in advance.

  See you,
  VInce

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