# Re: \[PATCH\] swiotlb: set IO TLB segment size via cmdline

- From: Christoph Hellwig \<hch@lst.de\>
- Date: 2021-09-15 13:53:28 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2021/09/1509413
- Thread: https://ratatoskr.run/xen-devel/2021/09/1508104/t.md

```text
On Wed, Sep 15, 2021 at 03:49:52PM +0200, Jan Beulich wrote:
> But the question remains: Why does the framebuffer need to be mapped
> in a single giant chunk?

More importantly: if you use dynamic dma mappings for your framebuffer
you're doing something wrong.
```