[Xen-devel] xen networking issue

[Fasiha Ashraf <feehapk@xxxxxxxxxxx>]

sorry forgot to change the subject of this email.

Hi all
I am using xen-3.4.1 with PV OS kernel 2.6.31.4 in FC11. When ever I try using a guest as web server to fetch its data from different nodes I dont experience enough speed even using 1G link on both sides. After running different bench marks I have come to know that while using guest as a sender on 1G link throughput goes down.

 #wget http://10.11.21.113/VTS_04_1.VOB
--2009-11-19 15:17:17--  http://10.11.21.113/VTS_04_1.VOB
Connecting to 10.11.21.113:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1073739776 (1024M) [text/plain]
Saving to: `VTS_04_1.VOB'

 0% [                                       ] 432,670     14.7K/s  eta 13h 51m ^C

here are some results i have collected using iperf.
Guest sending data to an external system
[root@fasiha fasiha]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.11.20.223 port 5001 connected with 10.11.21.113 port 50284
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-31.8 sec    952 KBytes    245 Kbits/sec

[root@F11-G3S1 ~]# iperf -c 10.11.20.223 -t 30
------------------------------------------------------------
Client connecting to 10.11.20.223, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.11.21.113 port 50284 connected with 10.11.20.223 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-30.2 sec    952 KBytes    259 Kbits/sec

Guest receiving data from external system
[root@F11-G3S1 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.11.21.113 port 5001 connected with 10.11.20.223 port 40423
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-30.0 sec  3.27 GBytes    937 Mbits/sec

[root@fasiha fasiha]# iperf -c 10.11.21.113 -t 30
------------------------------------------------------------
Client connecting to 10.11.21.113, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 10.11.20.223 port 40423 connected with 10.11.21.113 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-30.0 sec  3.27 GBytes    937 Mbits/sec

It should be the same or comparable in both cases. What could be the reason?

Regards,
Fasiha Ashraf

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