zfs compression

[zzkr7ex0f-beep]

I have another question: when testing ZFS with QAT compression on a Hygon CPU server, I found that the sequential read and random read performance is poor, but the write performance is pretty good. I wanted to ask if anyone has experience with this scenario.

[robn]

I have never used the QAT support in OpenZFS, but from code read my understanding is that it only works for gzip compression.

You'll need to compile ZFS with --with-qat; not sure what library support you need. If its available in your ZFS kernel module, there should be a /proc/spl/kstat/zfs/qat kstat node.

I'm keen to know how you go with it; I'd certainly like to understand better if this code is still useful.

[zzkr7ex0f-beep]

kstat is working.

Test Steps:

mkdir -p /opt/qat
tar -xvf QAT.L.4.20.0-00001.tar.gz
./configure --enable-kapi
make -j$(nproc)
make install

mkdir -p /qplus/zfs
tar -xzf zfs-2.2.4.tar.gz
./configure --with-qat=/opt/qat
make -j$(nproc)
make install
ldconfig && depmod -a
modprobe zfs

zpool create datapool raidz /dev/nvme2n1 /dev/nvme3n1 /dev/nvme4n1 /dev/nvme5n1 -o listsnapshots=on -O atime=off -O primarycache=metadata -o ashift=12 -f
zfs create -o volblocksize=32k -o refreservation=0B -o compression=gzip -V 1000G datapool/datatest

The above are simple steps for performing fio stress testing on zd0 with gzip compression enabled.

[zzkr7ex0f-beep]

我从未用过OpenZFS中的QAT支持，但从代码中我了解它只适用于压缩。gzip

你需要用;不确定你需要什么样的图书馆支持。如果你的 ZFS 内核模块里有 kstat 节点，应该会有一个 kstat 节点。--with-qat``/proc/spl/kstat/zfs/qat

我很想知道你是怎么用的;我当然想更好地理解这段代码是否仍然有用。

Are you still concerned about this issue?