Module Name: src Committed By: jdolecek Date: Sat May 19 15:13:26 UTC 2018
Modified Files: src/sys/uvm: uvm_bio.c Log Message: change code to take advantage of direct map when available, avoiding the need to map pages into kernel this improves performance of UBC-based (read(2)/write(2)) I/O especially for cached block I/O - sequential read on my NVMe goes from 1.7 GB/s to 1.9 GB/s for non-cached, and from 2.2 GB/s to 5.6 GB/s for cached read the new code is conditional now and off for now, so that it can be tested further; can be turned on by adjusting ubc_direct variable to true part of fix for PR kern/53124 To generate a diff of this commit: cvs rdiff -u -r1.94 -r1.95 src/sys/uvm/uvm_bio.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.