<div dir="ltr"><div><div>Hello Andreas,<br><br></div> Try passing amd_iommu=on to the kernel and see how that works.<br><br>Regards,<br></div>Iosif<br><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, Aug 21, 2014 at 6:21 PM, Gilberto Nunes <span dir="ltr"><<a href="mailto:gilberto.nunes32@gmail.com" target="_blank">gilberto.nunes32@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><a href="http://en.wikipedia.org/wiki/X86_virtualization#I.2FO_MMU_virtualization_.28AMD-Vi_and_VT-d.29" target="_blank">http://en.wikipedia.org/wiki/X86_virtualization#I.2FO_MMU_virtualization_.28AMD-Vi_and_VT-d.29</a><br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-21 13:06 GMT-03:00 <span dir="ltr"><<a href="mailto:lst_hoe02@kwsoft.de" target="_blank">lst_hoe02@kwsoft.de</a>></span>:<div><div>
<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hello,<br>
<br>
when inspecting the "dmesg" output on one of the PVE servers i got the follwoing:<br>
<br>
No AGP bridge found<br>
Node 0: aperture @ 0 size 32 MB<br>
Your BIOS doesn't leave a aperture memory hole<br>
Please enable the IOMMU option in the BIOS setup<br>
This costs you 64 MB of RAM<br>
Mapping aperture over 65536 KB of RAM @ 20000000<br>
PM: Registered nosave memory: 0000000020000000 - 0000000024000000<br>
AMD-Vi disabled by default: pass amd_iommu=on to enable<br>
<br>
My first action was to go to the BIOS (the machine is still test) and activated the IOMMU. The message stays the same. Next try was to set iommu=noaperture as boot parameter because it was suggested for machine having IOMMU but no AGP anymore. This lead to<br>
<br>
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)<br>
Placing 64MB software IO TLB between ffff880020000000 - ffff880024000000<br>
software IO TLB at phys 0x20000000 - 0x24000000<br>
<br>
Which looks like the IOMMU emulated in software...<br>
<br>
This lead to the question what the real benefits of AMD-Vi / IOMMU are for Proxmox/KVM if they are disabled by default and can not be enabled straight forward as it looks like?<br>
<br>
The Board in question is a ASUS KCMA-D8, BIOS 3102 with two AMD Opteron 4226 CPUs.<br>
<br>
Thanks for any hints<br>
<br>
Andreas<br>
<br>
<br>
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</blockquote></div></div></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><div>Obrigado</div><div><br></div><div>Cordialmente</div><div><br></div><div>Gilberto Ferreira</div><div><br><img src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcQh4Erzr4UMa0fHj33krlB24nJaqXvjEKtJVBebkpuLPh5HcWigtw"><br>
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