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 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
