of request for which the * total number is not limited by other means. As of kernel * 4.8, only two types of requests fall into this category: * * 1. Read-ahead requests * 2. Asynchronous direct the timestamp granularity supported by the file-system.© XXX Page 13 of 33 * The value should be power of 10. The default is 1, i.e. full * nano-second resolution. Filesystems supporting only second

cp_worker, efd)获得轮询文件句柄 ●调用poll(efd)等待有任务执行，然后再调用ucp_worker_progress() ●/dev/cpu_dma_latency 禁止power-saving模式 ●由于rdma速度很快，内核调度时延对性能影响很大。关键应用应开启busy poll。323334 BRPC怎么指定使用UCX?35 修改 BRPC ChannelOptions

chunks when the chunk size is set to 16MB. There will be lots of pressure on KV storage, so we use two-level mapping and introduced segment. 2. Segment is also the granularity of space allocation Client has been optimized to decouple the application from libcurve and add a NEBD module to join the two. l Nebdclient: Forward the requests from QEMU and curve-NBD to the specified NEBDServer through the test, the average latency was reduced by 11.5% and the IOPS increased by 13% in the case of two replicas. The gap is even greater under high stress. 2. User space Zero copy of user data

data. If one replica fails, the system can read and write data successfully on the other two replicas. When two copies fail at the same time, the system cannot determine the failure reason because only

storage system • High performance • Easiser operation • Cloud native • Curve is composed of two parts • Curve Block Storage (CurveBS) • CurveBS: a high performance cloud native distributed block