VIRTUAL CONFERENCE | JAN 12-14
Scylla supports two different networking modes—our own native Seastar network stack and the traditional Linux network stack to deliver low-latency, high-throughput TCP connections.
Seastar networking is a framework including a network stack that runs in userspace. It utilizes the open source DPDK driver and has additional TCP/IP code implemented on top. The network stack itself is transparently sharded and thus multiple TCP/IP instances are running on each core. This mode provides low-latency, high-throughput networking. No system calls are required for communicating, and no data copying ever occurs. This Seastar framework implementation ensures best performance. Seastar’s DPDK mode works on physical machines, virtual machines (either with devise assignment or with para virtual devices) and containers.
In this mode, Scylla consumes ordinary Linux networking APIs. Scylla preserves this mode for ease of application development and trivial deployment. Users can switch between modes dynamically and pick the networking mode that works best at first time usage or production installation.
Not using the default Linux network stack wasn’t a “not-invented-here” (NIH) decision for ScyllaDB. Our developer team is well experienced with OS development and we wanted to focus on optimizing database performance. So early on with the Seastar framework development we noticed that our sample Memcache application spent most of its time in the kernel. We couldn’t resist putting Seastar sharing and reactor design into action and we quickly coded our very own TCP/IP code. As you can see for Memcached, it performs miraculously well when one compares Seastar-native TCP vs Linux: Memcached Benchmark.
DPDK, the userspace network toolkit, is designed specifically for fast packet processing, usually in less than 80 CPU cycles per packet. It integrates with Linux seamlessly in order to take advantage of high-performance hardware. Traditionally L2/L3 software appliances use DPDK as a means to replace custom hardware with an of-the-shelf x86 one. To the best of our knowledge, Scylla and Seastar are the first products to integrate a higher layer application with DPDK kernel bypass. The ScyllaDB team is going to leverage this unique property and apply it to areas further beyond the basic database.
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