https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268102#M3363 <P>Thanks but it did not help.</P><P></P><P>Two serwers with 24GB RAM</P><P></P><P>with Hyper-V</P><P></P><P>cpu E5645 - network bandwitch 55MB/s</P><P>cpu E5606 - network bandwitch 95MB/s</P><P></P><P>no Hyper-V - network bandwitch 120MB/s</P> Mon, 26 Mar 2012 18:47:57 GMT idata 2012-03-26T18:47:57Z https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268100#M3361 <P>I have a new two Intel Server ( SC5600BRP, S5520HCT, E5645, 4xSAS RS2BL040 RAID 10, 2008 R2 x64 SP1).</P><P></P><P>When you install Hyper-V network performance drops by about 40 - 50%</P><P></P>The same network on the older server with the hyper-v role I have twice the bandwidth of the network. Ideas from google or special fixes microsoft does not help. Fri, 02 Mar 2012 23:27:00 GMT https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268100#M3361 idata 2012-03-02T23:27:00Z https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268101#M3362 <P>Check errata # 32 of the <A href="http://download.intel.com/support/motherboards/server/s5520hc/sb/e68105012_s5520hc_s5500hcv_s5520hct_msu_2011_09.pdf">http://download.intel.com/support/motherboards/server/s5520hc/sb/e68105012_s5520hc_s5500hcv_s5520hct_msu_2011_09.pdf</A> Specification update (PDF). </P> Fri, 09 Mar 2012 10:34:49 GMT https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268101#M3362 Edward_Z_Intel 2012-03-09T10:34:49Z https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268102#M3363 <P>Thanks but it did not help.</P><P></P><P>Two serwers with 24GB RAM</P><P></P><P>with Hyper-V</P><P></P><P>cpu E5645 - network bandwitch 55MB/s</P><P>cpu E5606 - network bandwitch 95MB/s</P><P></P><P>no Hyper-V - network bandwitch 120MB/s</P> Mon, 26 Mar 2012 18:47:57 GMT https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268102#M3363 idata 2012-03-26T18:47:57Z https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268103#M3364 <P>Do you have the latest <A href="http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&amp;DwnldID=18388">http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&amp;DwnldID=18388</A> NIC driver installed? </P> Tue, 27 Mar 2012 03:18:20 GMT https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268103#M3364 Edward_Z_Intel 2012-03-27T03:18:20Z https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268104#M3365 <P>yes and all defaults</P><P></P><P>all system updates installed </P> Tue, 27 Mar 2012 19:04:14 GMT https://community.intel.com/t5/Intel-Xeon-Processor-and-Server/2008-R2-with-hyper-v-half-the-network-bandwidth/m-p/268104#M3365 idata 2012-03-27T19:04:14Z