Date: Sat, 26 Sep 2020 00:33:34 +0200 From: Robert Clausecker <fuz@fuz.su> To: Mark Millard <marklmi@yahoo.com> Cc: Robert Crowston <crowston@protonmail.com>, freebsd-arm@freebsd.org Subject: Re: RPI 4B on UEFI: xhci0 disconnects under high load Message-ID: <20200925223334.GB3984@fuz.su> In-Reply-To: <FA5E1DB8-AE43-4934-B0AD-4D8200E132B3@yahoo.com> References: <20200924224749.GA18463@fuz.su> <66418AE0-79C9-4402-8325-7094E4230D38@yahoo.com> <20200925075822.GB51892@fuz.su> <9EBAAD5C-120D-4F7B-9C5F-1BB045CC1E17@yahoo.com> <Y-XjGjcz6f1wZ_boqk8rDM1oywdBjC1frQn_s0NR9BSa9VQAKH8sJjFGRn1-PTIecV-oHsfOjeYQvC9CVCiHy6uNg7YTZqTvaF3YG06LW2M=@protonmail.com> <FA5E1DB8-AE43-4934-B0AD-4D8200E132B3@yahoo.com>
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Hi Mark,
On Fri, Sep 25, 2020 at 10:08:41AM -0700, Mark Millard wrote:
>
>
> On 2020-Sep-25, at 03:39, Robert Crowston <crowston@protonmail.com> wrote:
>
> > Could the failure of the ACPI patch to work be related to the
> pre-September 2020 dtbs reporting 4 GB available for pci DMA
> (as you reported today in another thread)?
> >
>
> I'm unclear if you are specifically referring to:
>
> A) this thread's "disconnects under high load" failures?
> B) the huge file duplication and diff/cmp test failures?
> C) both?
> D) even more?
>
> For (A) I'd not conclude much until results are in for
> FreeBSD that is head -r365918 or later. It might be a
> fixed problem.
I've rebuild a kernel based on github revision e77e27fa:
pwm(8): fix potential duty overflow, use unsigneds for period and duty
Not sure what the revision number of that one is. The only
patch I applied is D25219 as the others don't cleanly apply.
The xhci disconnection error did not occur again. I'll check
if this also fixes the problem that I wasn't able to boot from
a disk attached to a USB 3.0 boot, but right now I don't have
physical access to the machine, so it'll have to wait.
Note that this was without the RAM size limiter on. Maybe I
didn't generate enough load for this to be an issue.
> For (B), I've been reporting examples of the issue since
> 2020-Jun-21 using rpi4-uefi-devel v1.16 and head -r360311 .
> But my most recent reports are based on the modern dtb that
> has 3 GiByte for the size of the range (uefi v1.20 and its
> bundled RPI4B materials or newer raspberry pi materials)
> and head -r365932. So both old and new got the same type
> of failures. (I've not tested materials from prior to
> 2020-Jun-21 with > 3072 MiByte in this way: that is when
> I discovered the test.)
>
> Does that answer your question?
>
> ===
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
Yours,
Robert Clausecker
--
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