Bugs item #2834538, was opened at 2009-08-09 20:23
Message generated for change (Comment added) made by thekozmo
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Andreas Unterkircher (unki)
Assigned to: Nobody/Anonymous (nobody)
Summary: low network speed with Windows virtio NIC drivers
Initial Comment:
Host-CPU: 2x Intel Xeon E5420 (Quad cores)
Host: KVM 85
Host: 64-bit
Guest: Windows XP (SP3) and Windows 2003 (SP2)
We are powering several guests on a KVM host. All of them using TAP interfaces
bridged together via one bridge. Within the guests we installed the lasted
virtio NIC drivers (from that ISO file). While the Interface status show that
the interfaces are set to 1Gbit/s, the maximum bandwidth we can achieve is
about 100-120Mbit/s (tested with iperf). Funilly, one the same host, two Debian
Lenny guests (so using 2.6.26 with builtin virtio modules) can achieve the full
bandwidth of 1Gbit/s and more without a problem.
So we suspect that the Windows virtio drivers for the NICs are causing this
problem.
How can we track down that problem? Can we provide more infos? We are willing
to help in debuggig!
Thx,
Andreas
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Comment By: Dor Laor (thekozmo)
Date: 2009-08-10 11:15
Message:
The driver should be able to saturate 1G link.
We'll soon post new version of the driver but there are no massive
changes.
You can try and play with the socket buffers (iperf -w), windows is very
sensitive for it.
Also, make sure TSO is on. Here is the windows registry configuration we
use:
TCPIP Params from the registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]
"NV Hostname"="marksbox"
"NameServer"=""
"ForwardBroadcasts"=dword:00000000
"IPEnableRouter"=dword:00000000
"Domain"=""
"Hostname"="marksbox"
"SearchList"=""
"UseDomainNameDevolution"=dword:00000000
"EnableICMPRedirect"=dword:00000001
"DeadGWDetectDefault"=dword:00000001
"DontAddDefaultGatewayDefault"=dword:00000000
"EnableSecurityFilters"=dword:00000000
"ReservedPorts"=hex(7):33,00,33,00,34,00,33,00,2d,00,33,00,33,00,34,00,33,00,00,00,00,00
"EnableTCPA"=dword:00000000
"EnableRSS"=dword:00000000
"EnableTCPChimney"=dword:00000000
"Tcp1323Opts"=dword:00000003
"TcpAckFrequency"=dword:00000002
"TcpWindowSize"=dword:00100000
"DhcpNameServer"="192.168.122.1"
For the Windows Socket Layer
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters]
"DefaultReceiveWindow"=dword:00100000
"DefaultSendWindow"=dword:00100000
Note that it looks like the 10G and 1G interfaces were slightly different
in the guest. Will investigate more
1G Interface
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\0012]
"BusNumber"="0"
"Characteristics"=dword:00000004
"BusType"="15"
"ComponentId"="pci\\ven_1af4&dev_1000&subsys_00010000"
"BatchReceive"="1"
"ConnectRate"="1000"
"ConnectTimer"="0"
"DebugLevel"="0"
"DoLog"="0"
"Gather"="1"
"HwOffload"="0"
"IPPacketsCheck"="0"
"LogStatistics"="0"
"OffLoad.TxIP"="0"
"OffLoad.TxLSO"="0"
"OffLoad.TxTCP"="0"
"PacketFilter"="0"
"Priority"="0"
"Promiscuous"="0"
"RxCapacity"="256"
"TxCapacity"="256"
"InfPath"="oem1.inf"
"InfSection"="kvmnet5.ndi"
"ProviderName"="Qumranet"
"DriverDateData"=hex:00,40,f5,36,ed,71,c9,01
"DriverDate"="1-9-2009"
"DriverVersion"="5.1.209.110"
"MatchingDeviceId"="pci\\ven_1af4&dev_1000&subsys_00010000"
"DriverDesc"="Qumranet ParaVirtualized Ethernet Adapter"
"NetCfgInstanceId"="{C4BF0807-F8F0-4A57-8BC5-85B2A9C5464A}"
10G Interface
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E972-E325-11CE-BFC1-08002bE10318}\0010]
"BusNumber"="0"
"Characteristics"=dword:00000004
"BusType"="15"
"ComponentId"="pci\\ven_1af4&dev_1000&subsys_00010000"
"BatchReceive"="1"
"ConnectRate"="1000"
"ConnectTimer"="0"
"DebugLevel"="0"
"DoLog"="0"
"Gather"="1"
"HwOffload"="1"
"IPPacketsCheck"="0"
"LogStatistics"="0"
"OffLoad.TxIP"="1"
"OffLoad.TxLSO"="1"
"OffLoad.TxTCP"="1"
"PacketFilter"="1"
"Priority"="0"
"Promiscuous"="0"
"RxCapacity"="256"
"TxCapacity"="256"
"InfPath"="oem1.inf"
"InfSection"="kvmnet5.ndi"
"ProviderName"="Qumranet"
"DriverDateData"=hex:00,40,f5,36,ed,71,c9,01
"DriverDate"="1-9-2009"
"DriverVersion"="5.1.209.110"
"MatchingDeviceId"="pci\\ven_1af4&dev_1000&subsys_00010000"
"DriverDesc"="Qumranet ParaVirtualized Ethernet Adapter"
"NetCfgInstanceId"="{249CC8A2-822D-46BF-8A64-CF572F7D07D6}"
----------------------------------------------------------------------
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