[Xen-users] GPLPV driver Send performance

[Klaus Steinberger <klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

in a Windows 2003 64bit VM I have the following problem with the GPLPV driver
(newest version 0.10.0.138 ):


Receiving is very fast, but sending is ugly slow. The host system is Scientific
Linux 5.4. Any Idea what I can do?

[root@gar-ha-xen01 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 192.168.160.130 port 5001 connected with 192.168.160.72 port 4992
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.9 sec    544 KBytes    411 Kbits/sec
[root@gar-ha-xen01 ~]# iperf -c tsm
------------------------------------------------------------
Client connecting to tsm, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.160.130 port 33337 connected with 192.168.160.72 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    587 MBytes    493 Mbits/sec
[root@gar-ha-xen01 ~]#
[root@gar-ha-xen01 ~]#
[root@gar-ha-xen01 ~]# ethtool -k eth2
Offload parameters for eth2:
Cannot get device udp large send offload settings: Operation not supported
Cannot get device GRO settings: Operation not supported
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
udp fragmentation offload: off
generic segmentation offload: off
generic-receive-offload: off
[root@gar-ha-xen01 ~]# ethtool eth2
Settings for eth2:
        Supported ports: [ FIBRE ]
        Supported link modes:
        Supports auto-negotiation: No
        Advertised link modes:  10000baseT/Full
        Advertised auto-negotiation: No
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: on
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: yes
[root@gar-ha-xen01 ~]#

Sincerly,
Klaus

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