Software > Operating Systems and Porting

kernel config: page size 4k vs 64k

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surf:
There were pictures of water cooled IBM hardware a while back.  It seems like the CPU block would be the only non-standard part.  Can Raptor get these from IBM?

pocock:
(I modified the code last night, now it builds 64k and 4k kernels as two different flavours so you can install both on the same system and choose between them in the petitboot menu, the 4k kernel file has 4k in the filename and ABI string)

Here is my patch for building a Debian kernel package with the 4k page size, like other architectures

To use it:


--- Code: ---mkdir -p ~/ws/kernel
cd ~/ws/kernel
wget http://deb.debian.org/debian/pool/main/l/linux/linux_4.19.132.orig.tar.xz
xzcat linux_4.19.132.orig.tar.xz | tar xf -
git clone https://gitlab.com/dpocock/linux-kernel-debian
cd linux-kernel-debian
git checkout pocock/buster-ppc64el-4k
cd ../linux-4.19.132
ln -s ../linux-kernel-debian/debian .
dpkg-buildpackage -rfakeroot -i.* --no-sign -b -j`grep -c ^processor /proc/cpuinfo`
cd ..

--- End code ---

You should find the packages *.deb in ~/ws/kernel

You can just install it with dpkg and reboot into the kernel with 4k page size

Beware: if you have a btrfs root filesystem with sectorsize=64, the kernel with 4k page size can't mount it.  If your root filesystem is ext4 it will just work.

If people are comfortable with this change then it will be a good idea to open bug reports for the kernel packaging teams in each of the relevant distributions.

pocock:
Today I made some tests comparing Firefox WebRTC on 64k and 4k page size

With a Logitech webcam, I found both 64k and 4k worked

With Elgato Camlink 4k, v4l2-loopback and my gstreamer script, I found it only worked on 4k.  With 64k, Firefox displayed the local monitor / self-view from the Camlink but the remote host wasn't receiving the picture.  Firefox was receiving the picture from the remote host, so this was a one-way video problem.

The gstreamer script is a very simple chroma-key example, it is not OBS but then it is less than 10 lines of code.

ClassicHasClass:

--- Quote from: pocock on September 15, 2020, 06:40:26 am ---Maybe that is why Thunderbird is not working at all either.

--- End quote ---

These were pretty low-level changes, so I don't know if they're what's blocking Thunderbird. But I run and test Firefox all the time. Perhaps, if there's interest, I can provide my binaries (I already provide my .mozconfigs).

pocock:

I've found the relevant config in the Fedora kernel package and posted about the same issue in the Fedora PPC mailing list

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