https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192452
Bug ID: 192452
Summary: vt_vga very slow since r269471
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The VGA driver has become unusably slow since r269471. I suspect that the
support for non-8x8 fonts has dramatically increased the incidence of reads
from VGA memory. It might be best if the driver could be refactored to avoid
reads entirely, for example by passing some concept of write granularity up
from the driver into the vt core so that vd_bitbltchr() is called only for
operations of that width (redrawing partial characters).
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