BSDCan2013 - Final
BSDCan 2013
The Technical BSD Conference
| Speakers | |
|---|---|
|
Bob Beck |
| Schedule | |
|---|---|
| Day | Talks - Day 2 - 2013-05-18 |
| Room | MNT 202 |
| Start time | 10:00 |
| Duration | 01:00 |
| Info | |
| ID | 396 |
| Event type | Lecture |
| Track | Hacking |
| Language used for presentation | English |
The Buffer Cache in OpenBSD
This talk goes over recent changes to the OpenBSD Midlayer and Buffer Cache.
OpenBSD has moved to a model where we support large buffer caches with a limited amount of kernel memory mapping. Buffers are mapped when in use, and unmapped when not in use. Buffers are flipped to/from DMA accessible regions when needed for io, but may be read from non DMA accessible memory.
This talk goes over the changes that have been made and the evolution of the OpenBSD buffer cache from a small fixed allocated array to it's current incarnation, and the interesting bugs and challenges that working in this area has exposed.