[Bug 192452] New: vt_vga very slow since r269471

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Aug 6 20:38:33 UTC 2014


            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: freebsd-bugs at FreeBSD.org
          Reporter: nwhitehorn at FreeBSD.org

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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