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xen-users
Re: [Xen-users] Good unidirectional TCP performance, weird asymetric per
Hi Pasi!
THanks for the fast reply!
Pasi Kärkkäinen schrieb:
> On Mon, Sep 22, 2008 at 11:11:37AM +0300, Pasi Kärkkäinen wrote:
>
>> Have you tried changing the vif* interface txqueuelen in dom? I'm wondering
>> if that would help..
>>
Yes I did. I changed the txqueulength from 0 (yes ifconfig shows me
ZERO) to 1000.
Should I change the txqueulength of the bridge too?
zeus:~# ifconfig
br0 Link encap:Ethernet HWaddr 00:1B:FC:DB:D2:79
inet addr:192.168.2.20 Bcast:192.168.2.255 Mask:255.255.255.0
inet6 addr: fe80::21b:fcff:fedb:d279/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2758816 errors:0 dropped:0 overruns:0 frame:0
TX packets:831349 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:3711167604 (3.4 GiB) TX bytes:861930334 (822.0 MiB)
eth0 Link encap:Ethernet HWaddr 00:1B:FC:DB:D2:79
inet6 addr: fe80::21b:fcff:fedb:d279/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1333 errors:0 dropped:0 overruns:0 frame:0
TX packets:908 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:178350 (174.1 KiB) TX bytes:124770 (121.8 KiB)
Interrupt:23
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:34 errors:0 dropped:0 overruns:0 frame:0
TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2576 (2.5 KiB) TX bytes:2576 (2.5 KiB)
vif2.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2757485 errors:0 dropped:0 overruns:0 frame:0
TX packets:829015 errors:0 dropped:1588 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3711013112 (3.4 GiB) TX bytes:860609840 (820.7 MiB)
Did no change at all (txqueuelength of vif and br0 changed to 1000):
apollo2:~#
dom0 <=> domU
iperf -c 192.168.2.20 -p5555 -t5
------------------------------------------------------------
Client connecting to 192.168.2.20, TCP port 5555
TCP window size: 23.3 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.2.22 port 39015 connected with 192.168.2.20 port 5555
[ 3] 0.0- 5.0 sec 788 MBytes 1.32 Gbits/sec
apollo2:~# iperf -c 192.168.2.20 -p5555 -t5 -d
------------------------------------------------------------
Server listening on TCP port 5555
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.2.20, TCP port 5555
TCP window size: 77.7 KByte (default)
------------------------------------------------------------
[ 5] local 192.168.2.22 port 39016 connected with 192.168.2.20 port 5555
[ 4] local 192.168.2.22 port 5555 connected with 192.168.2.20 port 48509
[ 5] 0.0- 5.0 sec 894 MBytes 1.50 Gbits/sec
[ 4] 0.0- 5.1 sec 25.3 MBytes 41.4 Mbits/sec
domU <=> dom0
apollo2:~# iperf -s -p5555
------------------------------------------------------------
Server listening on TCP port 5555
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.2.22 port 5555 connected with 192.168.2.20 port 59129
------------------------------------------------------------
Client connecting to 192.168.2.20, TCP port 5555
TCP window size: 38.8 KByte (default)
------------------------------------------------------------
[ 6] local 192.168.2.22 port 39017 connected with 192.168.2.20 port 5555
[ 6] 0.0-10.0 sec 1.68 GBytes 1.44 Gbits/sec
[ 4] 0.0-10.0 sec 40.3 MBytes 33.8 Mbits/sec
dom0 -> domU
[ 5] local 192.168.2.22 port 5555 connected with 192.168.2.20 port 59130
[ 5] 0.0-10.0 sec 703 MBytes 590 Mbits/sec
In openVZ the txqueuelength is also 0 and the bidirectional transfer
rate is not asymetric.
Any other ideas?
Best Regards
Volker
--
====================================================
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Dr. Volker Jaenisch http://www.inqbus.de
Herloßsohnstr. 12 0 4 1 5 5 Leipzig
N O T - F Ä L L E +49 ( 170 ) 3113748
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