Re: Slow TCP performance from Win2k8R2 guests under Linux KVM

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On Jul 16, 2013, at 1:10 AM, Gordon Messmer wrote:

> Would anyone be so kind as to test the performance of TCP streams on Windows 2k8R2 guests of KVM virt servers?
> 
> Red Hat's virtio-win-1.6.3 package was published to address a problem described as "low performance" on Win2k8 guests.  Actual performance was not recorded in the bug report.
> 
> On my KVM servers, Windows 2k8R2 guests are able to send data at less than 4Mbps.  I test this by using netcat on Windows and piping a file to its input.  The receiving end of the transfer is an un-virtualized CentOS system.  Transfer rate is measured by selecting the stream in iptraf while it is active.
> 

Can you provide results with iperf or netperf?


Thanks,
Yan.


> UDP transfers, such as by CIFS, will send data at around 400Mbps.
> 
> TCP transfers from Windows 2012 or Windows 8 are not similarly affected.
> 
> The same driver for Win2k8 was published by Red Hat in virtio-win 1.6.3, 1.6.4, and 1.6.5.
> 
> Does anyone see TCP transfer rates from Win2k8R2 that don't look ridiculously slow?
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=859882
> http://rhn.redhat.com/errata/RHBA-2013-0441.html
> http://joncraton.org/blog/46/netcat-for-windows
> 
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