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Can anyone comment regarding
CONFIG_HZ_100/CONFIG_HZ_300/CONFIG_HZ_1000 impact on VM performance?
I think archlinux thread suggested CONFIG_HZ_1000, stock archlinux
has CONFIG_HZ_100 and vfio kernel has CONFIG_HZ_300. Are these even
important with rcu_nocbs/nohz_full kernel parameters?<br>
<br>
<div class="moz-cite-prefix">On 2016.02.28 12:51, thibaut noah
wrote:<br>
</div>
<blockquote
cite="mid:CANNiY3ePhXZmaBiA+45jYG=eNqvcoRv8uSRkRpOVw1fQNG5acQ@mail.gmail.com"
type="cite">I personnaly needed the acs patch and add to make
myself a custom kernel on fedora (hba card for zfs raid).<br>
Arch is easier for this since one guy is maitaining a patched
kernel, you just have to download it. <br>
<div class="gmail_quote">
<div dir="ltr">On Sun, 28 Feb 2016 at 10:14, Okky Hendriansyah
<<a moz-do-not-send="true"
href="mailto:okky@nostratech.com">okky@nostratech.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>
<p class="gmail_quote"><span
style="background-color:rgba(255,255,255,0)">On
February 28, 2016 at 15:42:05, stein van broekhoven (<a
moz-do-not-send="true"
href="mailto:stein@aapjeisbaas.nl" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:stein@aapjeisbaas.nl">stein@aapjeisbaas.nl</a></a>)
wrote:</span></p>
<blockquote type="cite" class="gmail_quote">
<div dir="auto">
<div>
<div><font color="#000000">...</font></div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<div>
<blockquote type="cite" class="gmail_quote">
<div dir="auto">
<div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)"><br>
</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">If
anybody would attempt a build like this I
would recommend Manjaro with plasma 5.5 (KDE)</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">And
follow this guide:</span></font></div>
<div><a moz-do-not-send="true"
href="https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF"
style="background-color:rgba(255,255,255,0)"
target="_blank"><font color="#000000">https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF</font></a></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">Only
difference is:</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">#
mkinitcpio -p linux</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">#
mkinitcpio -p linux41</span></font></div>
<div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)"><br>
</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">You
do NOT need the kernel patch from:</span></font></div>
<div><a moz-do-not-send="true"
href="https://aur.archlinux.org/packages/linux-vfio/"
style="background-color:rgba(255,255,255,0)"
target="_blank"><font color="#000000">https://aur.archlinux.org/packages/linux-vfio/</font></a></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)"><br>
</span></font></div>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)"><br>
<br>
</span></font>
<div><font color="#000000"><span
style="background-color:rgba(255,255,255,0)">Sent
from my iPhone</span></font></div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<div><br>
</div>
<div>Hi Stein,</div>
<div><br>
</div>
<div>Please correct me if I am wrong, but I think the
question of whether one needs the kernel patches that
linux-vfio incorporates or not, really depends on one's
setup and hardware.</div>
<div><br>
</div>
<div>The Intel HD arbitration patch is still needed if
legacy VGA assignment (with Seabios) is still being used
on Intel platforms with integrated Intel HD Graphics.</div>
<div><br>
</div>
<div>The PCIe ACS override patch is still needed if the
platform does not support ACS and using other available
PCIe slots for the host. Although I've seen in this list
that sometimes not all ACS cases can be solved by this
patch.</div>
<div><br>
</div>
<div>For instance, my previous platform was Haswell i7-4770
with a GTX 980, a USB 3.0 card, and a NIC card passed to
Windows 10 guest (OVMF) while having a RAID card in the
last PCIe slot for my Arch Linux host ZFS disk array. In
my case, I did not need the Intel HD arbitration patch
since I use the legacy-free approach with OVMF. But I
still need the PCIe ACS override patch since the default
IOMMU grouping did not separate my RAID card with other
PCIe devices.</div>
<div><br>
</div>
<div>Other example on one of the members here, had similar
platform as mine. But he only has a GPU on his slots, thus
he did not need the PCIe ACS override patch.</div>
<div><br>
</div>
<div>Best regards,</div>
<div>Okky Hendriansyah</div>
<div><br>
</div>
<div><br>
</div>
</div>
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</blockquote>
</div>
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