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[Qemu-devel] [Bug 1228285] [NEW] e1000 nic TCP performances
From: |
Vincent Autefage |
Subject: |
[Qemu-devel] [Bug 1228285] [NEW] e1000 nic TCP performances |
Date: |
Fri, 20 Sep 2013 17:21:23 -0000 |
Public bug reported:
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
** 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=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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