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    <title>topic Re: DirectPath IO enabled by default on VMs with VMXNET3 in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2915731#M282411</link>
    <description>&lt;P&gt;Does anyone know if there's an official KB describing the "&lt;SPAN&gt;its just a check box checked that isn't really doing anything" or confirms it's just a bug in the GUI?&lt;/SPAN&gt;&lt;/P&gt;</description>
    <pubDate>Fri, 24 Jun 2022 06:43:52 GMT</pubDate>
    <dc:creator>mkfmevntm</dc:creator>
    <dc:date>2022-06-24T06:43:52Z</dc:date>
    <item>
      <title>DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895481#M280394</link>
      <description>&lt;P&gt;There are some tidbits about this in various forums, none of which declare any official impact to VM performance.&amp;nbsp; However, there was a VMware KB published that recommended this be disabled.&amp;nbsp; &amp;nbsp;that said, the KB no longer exists.&amp;nbsp; Go ahead and access it and see the page can't be found message:&amp;nbsp; &amp;nbsp;&lt;A href="https://kb.vmware.com/s/article/2145889" target="_blank" rel="noopener nofollow ugc"&gt;https://kb.vmware.com/s/article/2145889&lt;/A&gt;&lt;/P&gt;&lt;P&gt;So I'm officially reaching out to the experts at VMware to ask, is there any impact to this setting being enabled?&amp;nbsp; &amp;nbsp;My guess is no, which could be why VMware took down the KB.&amp;nbsp; &amp;nbsp;But it would be better suited to leave a KB up and simply state that its safe to ignore this, or otherwise provide some guidance for customers.&lt;/P&gt;&lt;P&gt;Thanks in advance to your advice&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 25 Feb 2022 15:45:34 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895481#M280394</guid>
      <dc:creator>kwg66</dc:creator>
      <dc:date>2022-02-25T15:45:34Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895524#M280397</link>
      <description>&lt;P&gt;Generally you want a device to either be configured with virtualization (like vmxnet3 for networking) or in passthrough mode (with DirectPath IO enabled). Having DirectPathIO enabled with VMXNET3 is just a misconfiguration. It was a bug and it has been fixed.&lt;/P&gt;&lt;P&gt;Depending on the application networking performance needs vs. virtualization benefits (like vMotion, HA etc.) you would want to configure your networking device appropriately. There is usually some overhead to virtualization , but the benefits obtained need to be weighed against the performance consideration.&lt;/P&gt;</description>
      <pubDate>Fri, 25 Feb 2022 19:09:05 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895524#M280397</guid>
      <dc:creator>sramanuja</dc:creator>
      <dc:date>2022-02-25T19:09:05Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895527#M280398</link>
      <description>&lt;P&gt;Vmotion continues to work unless there is actually a true mapping to the PCI device where direct path IO is in proper use.&amp;nbsp; &amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;the question that needs answering is whether enabling Direct Path IO on the vmxnet3 adapter will have any performance impact on the VM when there is no actual mapping to a PCI device.&amp;nbsp; &amp;nbsp;After all, enabling Direct Path on VMXNET3 is useless without a mapping to the PCI device, so for the most part, at first glance,&amp;nbsp; its just a check box checked that isn't really doing anything.&amp;nbsp; But VMware should have an answer as to whether there is a performance impact to the VM when this check box is checked and no actual mapping to a PCI device exists.&amp;nbsp; &amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 25 Feb 2022 19:25:08 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895527#M280398</guid>
      <dc:creator>kwg66</dc:creator>
      <dc:date>2022-02-25T19:25:08Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895533#M280399</link>
      <description>&lt;P&gt;IMHO is an interesting question,&lt;/P&gt;&lt;P&gt;In vCenter 7.0U3C when creating a new virtual machine and adding a VMXNET3 network adapter, as stated by&amp;nbsp;&lt;a href="https://communities.vmware.com/t5/user/viewprofilepage/user-id/2527916"&gt;@kwg66&lt;/a&gt;, it did select by default the DirectPath I/O option. I beg your pardone, but if it's a bug in the vCenter GUI interface, then is not resolved.&lt;/P&gt;&lt;P&gt;Beside doing apparently nothing I also dig on the web about this option but also I have not found any clear indication on Vm impact performance.&lt;/P&gt;&lt;P&gt;Well, a "lab" obviously is not a production environment but I tend to approxymate it as much as possible, eventually replicanting useful thing on the "real world".&lt;/P&gt;&lt;P&gt;Regards.&lt;/P&gt;</description>
      <pubDate>Fri, 25 Feb 2022 21:01:29 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895533#M280399</guid>
      <dc:creator>Kinnison</dc:creator>
      <dc:date>2022-02-25T21:01:29Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895536#M280401</link>
      <description>&lt;P&gt;Thanks for chiming in Kinnison - I think we can all agree that our employers don't care to have us spending time in a lab environment trying to understand the behavior of VMware issues that they themselves should have a handle on and properly advise customers about.&amp;nbsp; &amp;nbsp;&lt;img class="lia-deferred-image lia-image-emoji" src="https://communities.vmware.com/html/@DCF4E2F7991292CEECF250394DB2C2BC/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 25 Feb 2022 21:05:01 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2895536#M280401</guid>
      <dc:creator>kwg66</dc:creator>
      <dc:date>2022-02-25T21:05:01Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2915731#M282411</link>
      <description>&lt;P&gt;Does anyone know if there's an official KB describing the "&lt;SPAN&gt;its just a check box checked that isn't really doing anything" or confirms it's just a bug in the GUI?&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 24 Jun 2022 06:43:52 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2915731#M282411</guid>
      <dc:creator>mkfmevntm</dc:creator>
      <dc:date>2022-06-24T06:43:52Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2928703#M283716</link>
      <description>&lt;P&gt;&lt;a href="https://communities.vmware.com/t5/user/viewprofilepage/user-id/4686890"&gt;@sramanuja&lt;/a&gt;&amp;nbsp;hey there,&lt;/P&gt;&lt;P&gt;could you please help us get this lingering question answered? is the DirectPath I/O checkbox doing anything when (automatically) selected for a VMXNET3 adapter?&lt;/P&gt;</description>
      <pubDate>Tue, 13 Sep 2022 19:54:37 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2928703#M283716</guid>
      <dc:creator>fvops</dc:creator>
      <dc:date>2022-09-13T19:54:37Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2928815#M283727</link>
      <description>&lt;P&gt;&lt;STRONG&gt;Hi,&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;Even with the vCenter 7.0U3g object whenever a virtual machine with a VMxnet3 network interface is created, still the "direct path I/O" option get enabled by default.&amp;nbsp;A bug supposed to have been corrected some time ago, but no, it is still there (and it is not the only, long standing, one).&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG&gt;Regards,&lt;/STRONG&gt;&lt;BR /&gt;&lt;STRONG&gt;Ferdinando&lt;/STRONG&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 14 Sep 2022 10:35:26 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2928815#M283727</guid>
      <dc:creator>Kinnison</dc:creator>
      <dc:date>2022-09-14T10:35:26Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932046#M284002</link>
      <description>&lt;P&gt;Ive submitted a call requesting definitive word on whether having DPIO checked with no passthrough devices set is likely to cause any issues.&lt;/P&gt;</description>
      <pubDate>Wed, 05 Oct 2022 11:06:59 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932046#M284002</guid>
      <dc:creator>divadiow</dc:creator>
      <dc:date>2022-10-05T11:06:59Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932082#M284005</link>
      <description>&lt;P&gt;I see from the case description that you are requesting information in relation to DPIO being enabled on your VMs.&lt;BR /&gt;&lt;BR /&gt;The presence of the checked "DirectPath I/O" field in the VMXNET3 network adapter is a sub optimal UI name for an old, rarely used feature (ethernetX.uptCompatibility, "Universal PassThrough", basically allowing vMotion for Passthrough NICs on Cisco HW with a specific 3rd party VDS) that currently doesn't do anything. There is no impact on having it enabled.&amp;nbsp;&lt;BR /&gt;&lt;BR /&gt;"The support for DirectPath I/O enabled has been removed. i.e uptCompatibilityEnabled property is no longer supported." This is from one of our internal documents.&amp;nbsp;&lt;BR /&gt;&lt;BR /&gt;DirectPath I/O would not be in use until it is configured to do so on the host. This can be configured by enabling a passthrough device for a network adapter on the host.&amp;nbsp;&lt;BR /&gt;Once this is enabled, the VM a can then be configured to use this passthrough device by adding a PCI device as an adapter and in turn using DirectPath I/O.&lt;BR /&gt;&lt;BR /&gt;&lt;BR /&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 05 Oct 2022 13:51:05 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932082#M284005</guid>
      <dc:creator>divadiow</dc:creator>
      <dc:date>2022-10-05T13:51:05Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932085#M284006</link>
      <description>&lt;P&gt;&lt;STRONG&gt;Hi,&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;So it's seems another incongruity of the user interface of the vCenter object that no one has bothered to remedy while acknowledging its obvious uselessness.&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG&gt;Regards,&lt;/STRONG&gt;&lt;BR /&gt;&lt;STRONG&gt;Ferdinando&lt;/STRONG&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 05 Oct 2022 14:20:30 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2932085#M284006</guid>
      <dc:creator>Kinnison</dc:creator>
      <dc:date>2022-10-05T14:20:30Z</dc:date>
    </item>
    <item>
      <title>Re: DirectPath IO enabled by default on VMs with VMXNET3</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2979231#M289248</link>
      <description>&lt;P&gt;I had the same question.&lt;BR /&gt;As someone else stated that must be misnamed old and disused feature that still has not been removed from the options menu.&lt;/P&gt;&lt;P&gt;Even today with 8U1 that option is still shown in the settings of the vmxnet3 network adapter.&lt;/P&gt;&lt;P&gt;&lt;img class="lia-deferred-image lia-image-emoji" src="https://communities.vmware.com/html/@A5AF993F89FC883B1750F8915C03D452/emoticons/1f615.png" alt=":confused_face:" title=":confused_face:" /&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 26 Jul 2023 09:07:02 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/DirectPath-IO-enabled-by-default-on-VMs-with-VMXNET3/m-p/2979231#M289248</guid>
      <dc:creator>WuGeDe</dc:creator>
      <dc:date>2023-07-26T09:07:02Z</dc:date>
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