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    <title>topic Re: poor performance using private network between VMs in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926162#M283517</link>
    <description>&lt;P&gt;please check copy with Linux VM .&lt;/P&gt;</description>
    <pubDate>Sun, 28 Aug 2022 10:23:46 GMT</pubDate>
    <dc:creator>D_G_Tal</dc:creator>
    <dc:date>2022-08-28T10:23:46Z</dc:date>
    <item>
      <title>poor performance using private network between VMs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926147#M283516</link>
      <description>&lt;P&gt;We have created a virtual switch with no uplink to a physical network adapter to use as a private network between VMs.&amp;nbsp; When performing rsync copies, the speeds are much lower than expected.&amp;nbsp; The copy speeds average around 85 MB per second.&amp;nbsp; Any suggestions on improving these speeds would be appreciated.&amp;nbsp; Thank you.&lt;/P&gt;</description>
      <pubDate>Sun, 28 Aug 2022 03:52:56 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926147#M283516</guid>
      <dc:creator>rmuzer</dc:creator>
      <dc:date>2022-08-28T03:52:56Z</dc:date>
    </item>
    <item>
      <title>Re: poor performance using private network between VMs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926162#M283517</link>
      <description>&lt;P&gt;please check copy with Linux VM .&lt;/P&gt;</description>
      <pubDate>Sun, 28 Aug 2022 10:23:46 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926162#M283517</guid>
      <dc:creator>D_G_Tal</dc:creator>
      <dc:date>2022-08-28T10:23:46Z</dc:date>
    </item>
    <item>
      <title>Re: poor performance using private network between VMs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926163#M283518</link>
      <description>&lt;P&gt;I assume that you are using ESXi, so I moved your post to that community. If you are using another product, please let me know.&lt;/P&gt;
&lt;UL&gt;
&lt;LI&gt;What type/model of virtual network adapters (e.g. &lt;EM&gt;vmxnet3&lt;/EM&gt;) is in use?&lt;/LI&gt;
&lt;LI&gt;Didi you also run a test that only measures network speed, i.e. rules out possible storage performance issues?&lt;/LI&gt;
&lt;/UL&gt;
&lt;P&gt;André&lt;/P&gt;</description>
      <pubDate>Sun, 28 Aug 2022 10:24:08 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926163#M283518</guid>
      <dc:creator>a_p_</dc:creator>
      <dc:date>2022-08-28T10:24:08Z</dc:date>
    </item>
    <item>
      <title>Re: poor performance using private network between VMs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926307#M283537</link>
      <description>&lt;P&gt;We all need more info than what you have provided.&lt;BR /&gt;&lt;BR /&gt;Are the VMs on a single physical host or multiple physical hosts in a cluster?&lt;/P&gt;&lt;P&gt;What type of storage are the VMs sitting on? Is it external Tier 1 or 2 storage or internal SSD or NVMe disk?&lt;/P&gt;&lt;P&gt;What is the MTU of the NIC/s in the OS and/or physical switch interfaces?&lt;/P&gt;&lt;P&gt;What vNIC driver are you using? vmxnet3 or e1000?&lt;/P&gt;&lt;P&gt;What are your TCP/IP settings? LRO, TSO, LSO, Ring Buffer size, etc. You could be dropping receive/transmit packets in/out of the OS. Your ring buffers probably need to be increased to 4096 if you are trying to move a large amount of data.&lt;/P&gt;</description>
      <pubDate>Mon, 29 Aug 2022 16:53:21 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926307#M283537</guid>
      <dc:creator>grimsrue</dc:creator>
      <dc:date>2022-08-29T16:53:21Z</dc:date>
    </item>
    <item>
      <title>Re: poor performance using private network between VMs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926548#M283564</link>
      <description>&lt;P&gt;Yes, we are using ESXi so thank you for moving to the proper community.&amp;nbsp; As for the issue, we are using vmxnet3 as the virtual adapter.&amp;nbsp; When copying to/from this vm to other physical hosts on our network with a 10Gb adapter, the speeds are much higher, so I'm pretty sure disk performance is not the issue.&amp;nbsp; Any other thoughts would be appreciated.&lt;/P&gt;</description>
      <pubDate>Tue, 30 Aug 2022 22:10:18 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/poor-performance-using-private-network-between-VMs/m-p/2926548#M283564</guid>
      <dc:creator>rmuzer</dc:creator>
      <dc:date>2022-08-30T22:10:18Z</dc:date>
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