linux-kernel - Re: [PATCH] swiotlb: set IO TLB segment size via cmdline

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Message-ID: <alpine.DEB.2.21.2109141838290.21985@sstabellini-ThinkPad-T480s>
Date:   Tue, 14 Sep 2021 18:51:01 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     rm.skakun@...il.com
cc:     Jan Beulich <jbeulich@...e.com>,
        Roman Skakun <rm.skakun@...il.com>,
        Andrii Anisov <andrii_anisov@...m.com>,
        Roman Skakun <roman_skakun@...m.com>,
        Jonathan Corbet <corbet@....net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Maciej W. Rozycki" <macro@...am.me.uk>,
        Muchun Song <songmuchun@...edance.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Mike Rapoport <rppt@...nel.org>, Will Deacon <will@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-mips@...r.kernel.org,
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        hch@....de
Subject: Re: [PATCH] swiotlb: set IO TLB segment size via cmdline

On Tue, 14 Sep 2021, Christoph Hellwig wrote:
> 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.

Also, Option 1 listed in the webpage seems to be a lot better. Any
reason you can't do that? Because that option both solves the problem
and increases performance.