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[Qemu-devel] [Bug 1228285] Re: e1000 nic TCP performances


From: Launchpad Bug Tracker
Subject: [Qemu-devel] [Bug 1228285] Re: e1000 nic TCP performances
Date: Mon, 18 Jun 2018 04:17:38 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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

Title:
  e1000 nic TCP performances

Status in QEMU:
  Expired

Bug description:
  Hi,

  Here is the context :

  $ qemu -name A -m 1024 -net nic vlan=0,model=e1000 -net 
socket,vlan=0,listen=127.0.0.1:7000
  $ qemu -name B -m 1024 -net nic vlan=0,model=e1000 -net 
socket,vlan=0,connect=127.0.0.1:7000

  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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