Building a High Performance Raw Disk Subsystem for Alpha/Linux

Garlick, Jim

Lawrence Livermore National Laboratory

关键词: Computers;    Benchmarks;    Performance;    Kernels;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;   

DOI  :  10.2172/15006845
RP-ID  :  UCRL-ID-144213
RP-ID  :  W-7405-ENG-48
RP-ID  :  15006845

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Linux kernel version 2.2.19 lacks UNIX-style raw disk support, and its SCSI layer is optimized for small transfer sizes. This report describes kernel patches to add raw disk support and enhance performance in the SCSI layer and QLA2x00 Fibre Channel device driver for large transfer sizes. Benchmarks demonstrate raw disk performance of 191 megabytes/second write, 176 megabytes/second read for one megabyte random I/O on a Compaq ES40 computer system with two QLogic QLA2200F Fibre Channel host bus adapters, each connected to two Ciprico RF7010 arrays on arbitrated loop.