Re: wired memory leak?

[RVP <rvp%SDF.ORG@localhost>]

On Sat, 7 Nov 2026, Greg Troxel wrote:

> A brief followup that setting acceleration to UXA makes the leak not
> happen.
>
> For a very long time (2023?), I had in /etc/xorg.conf all but the
> AccelMethod line:
>
>  Section "Device"
>          Identifier      "Card0"
>          Driver          "modesetting"
>          Option          "AccelMethod"   "UXA"
>  EndSection

`AccelMethos UXA' is not valid for `modesetting'. It's either `glamor' or bust
ie. (`none'). This becomes `AccelMethod none':

https://github.com/NetBSD/xsrc/blob/trunk/external/mit/xorg-server/dist/hw/xfree86/drivers/modesetting/driver.c#L967

You should see `glamor' being turned off, and X falling back to the LLVM
softpipe renderer in Xorg.0.log.

> Wire pages stay within 12200-12300, with X running, with or without
> firefox.  top reports 48M.  This has been stable 2d 18h.

This depends on the size of the framebuffer (x2)--18MB for me (1920x1200x4 x2).
But, `modesetting' with `AccelMethod none' crashes in `libshadow' when the
server exits. One has to `Option "ShadowFB" "off"' to "fix" this.

-RVP