Hi, I'm @pizhenwei

I'm interested in the Linux operating system and various software projects. I've contributed to Linux, QEMU, libvirt, libiscsi, SPDK, tgt, Valkey, Redis, BCC, atop, rdma-core, util-linux, and procps-ng.

• I developed Valkey over RDMA, a feature merged into Valkey 8.0 that allows clients to communicate with the Valkey server via RDMA, improving QPS by approximately 250% and reducing latency by about 50%. I also developed Valkey over MPTCP, Valkey LTTNG-based tracing events, and more. I'm a top contributor to Redis/Valkey/libvalkey.
• I contributed the virtio crypto kernel driver, the QEMU backend, and the virtio crypto specification for akcipher support, enabling guests to offload RSA/ECDSA operations to the host. This allows nginx (with OpenSSL) to improve HTTPS performance by up to ~200%. I have been maintaining the cryptodev subsystem of QEMU since March 2023.
• I have also contributed patches to the mm, NVMe, InfiniBand, virtio, and pvpanic subsystems of the Linux kernel. In total, I've contributed about 100 patches to Linux and QEMU combined.
• I contributed multiple patches to atop​ and developed atophttpd, a web‑based version of atop that provides remote access without requiring login. It also supports batch retrieval of system‑level and process‑level status across multiple servers.
• I authored the irqtop, sirq, and blkpr commands and enhanced lsblk in util-linux. Suggestions and feedback are welcome!
• I wrote the hugetop command in procps. Suggestions and feedback are welcome!
• I created the tcprtt, virtiostat, and rdmaucma commands, and improved runqslower, killsnoop, trace, and funccount in BCC. Suggestions and feedback are welcome!
• I'm familiar with iSCSI, iSER, and NVMe‑oF. I contributed about 100 patches to libiscsi, SPDK, tgt and the kernel NVMe‑oF target, and also developed the userspace NVMe‑oF initiator libnvmf, which enables QEMU block performance of up to ~200K IOPS.
• I worked on the Virtio Over Fabrics specification, Linux driver demonstration code, and the Virtio‑oF target, though this project is currently on hold.
• I created the kvm-utils​ project, which includes low-level CPU benchmark tools for APIC, IPI, MSR, TLB shootdown, PIO, and MMIO operations.

📫 Email: zhenwei.pi@linux.dev