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Re: [PATCH] swiotlb: set IO TLB segment size via cmdline
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Christoph Hellwig <hch@xxxxxx>
- Date: Tue, 14 Sep 2021 17:30:46 +0200
- Cc: Roman Skakun <rm.skakun@xxxxxxxxx>, Andrii Anisov <andrii_anisov@xxxxxxxx>, Roman Skakun <roman_skakun@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Randy Dunlap <rdunlap@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Maciej W. Rozycki" <macro@xxxxxxxxxxx>, Muchun Song <songmuchun@xxxxxxxxxxxxx>, Viresh Kumar <viresh.kumar@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 14 Sep 2021 15:30:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Sep 14, 2021 at 05:29:07PM +0200, Jan Beulich wrote:
> I'm not convinced the swiotlb use describe there falls under "intended
> use" - mapping a 1280x720 framebuffer in a single chunk? (As an aside,
> the bottom of this page is also confusing, as following "Then we can
> confirm the modified swiotlb size in the boot log:" there is a log
> fragment showing the same original size of 64Mb.
It doesn't. We also do not add hacks to the kernel for whacky out
of tree modules.
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