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xen-users
Re: [Xen-users] Win2k3 GPLPV Network issue (2)
The version of Xen is 3.3.1. Qemu and HVM are from this same source
package. I just upgraded the drivers to the latest 0.9.12-pre13
version.
I also just disabled checksum offloading and checksum checking on RX
packets. It looks like that makes no difference.
I run the iperf server as "iperf -u -s -i 1".
Following is some output from the client.
# iperf -u -c 192.168.0.4
------------------------------------------------------------
Client connecting to 192.168.0.4, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 107 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.10 port 35602 connected with 192.168.0.4 port 5001
[ 3] 0.0-10.0 sec 1.25 MBytes 1.05 Mbits/sec
[ 3] Sent 893 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 1.22 MBytes 1.02 Mbits/sec 6.944 ms 24/ 893 (2.7%)
# iperf -u -c 192.168.0.4 -b 100m
------------------------------------------------------------
Client connecting to 192.168.0.4, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 107 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.10 port 35602 connected with 192.168.0.4 port 5001
[ 3] 0.0-10.0 sec 120 MBytes 101 Mbits/sec
[ 3] Sent 85471 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 110 MBytes 92.2 Mbits/sec 0.142 ms 7103/85437 (8.3%)
[ 3] 0.0-10.0 sec 1 datagrams received out-of-order
# iperf -u -c 192.168.0.4 -b 1000m
------------------------------------------------------------
Client connecting to 192.168.0.4, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 107 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.10 port 35602 connected with 192.168.0.4 port 5001
[ 3] 0.0-10.0 sec 950 MBytes 797 Mbits/sec
[ 3] Sent 677652 datagrams
[ 3] Server Report:
[ 3] 0.0-10.3 sec 615 MBytes 503 Mbits/sec 15.303 ms
238487/677396 (35%)
2009/1/6 James Harper <james.harper@xxxxxxxxxxxxxxxx>:
>>
>> Sorry for the previous unfinished E-mail. I managed to send it already
>> using a weird Gmail key combination...
>>
>> Hi. I am running Windows 2003 Server with James' excellent GPLPV
>> drivers. They significantly boosted the network throughput (I get
>> around 600 Mbit using iperf).
>> However, I am having some trouble with the ethernet. We are using an
>> accounting application that uses Samba shares to store it's (database)
>> data. It is very poorly written, and since I moved from a physical
>> Win2k machine to a Xen-based Win2k3 machine, it keeps crashing. I
>> thought that it was just due the poor quality of the software, but
>> since I have started using Bacula for the backups, I suspect the
>> network drivers. Bacula fails almost every backup job (Connection
>> reset by peer) to the two Win2k3 machines running on the same Xen
>> server. It has no problems backing up other (physical) machines.
>>
>> I tested the packet loss using Iperf UDP tests, and as soon as I
>> increase the bandwidth, I get packet loss values up to 39%.
>
> Can you tell me the bandwidth figures you were testing with?
>
>>
>> I also run a paravirtual Linux guest on this same Xen server that
>> doesn't suffer from this packet loss.
>>
>> Is there something I can do?
>
> Try turning off checksum and large send offloading as a first thing to
> try.
>
> James
>
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