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[Bug 1864984] Re: "nr_entries is too big" when using virgl
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From: |
Gerd Hoffmann |
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Subject: |
[Bug 1864984] Re: "nr_entries is too big" when using virgl |
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Date: |
Thu, 27 Feb 2020 11:59:23 -0000 |
/me wonders what gnome shell is doing there ...
It is the number of scatter list entries for resources. Even in the worst case
(no chunks are continous in memory so each single page needs an entry) this is
enough for 64 MB. An 4k display
framebuffer needs less than that.
Removing the limit isn't an option. Raising maybe.
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https://bugs.launchpad.net/bugs/1864984
Title:
"nr_entries is too big" when using virgl
Status in QEMU:
New
Bug description:
I have a bootable image where GNOME Shell fails because it hits a
limit in virtio-gpu.
In `hw/display/virtio-gpu.c`, there is a limit for `nr_entries` at
16384. There is no explanation for that limit. But there does not seem
to be any limit on the kernel side.
Raising this limit with a patch to 262144 solves the issue.
Could there be an explanation why this limit is needed? And why this
value? Or could this limit be just removed?
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