Date: Sat, 17 Apr 2021 11:38:05 +0200 From: Ronald Klop <ronald-lists@klop.ws> To: freebsd-arm@freebsd.org Subject: Re: RPi 4B USB 3 support appears to still be broken in 13.0-RELEASE Message-ID: <187de31a-e96f-aa98-23a4-e0fb63de5671@klop.ws> In-Reply-To: <YHoXAS%2B0/ptwL0IS@fuz.su> References: <YHoXAS%2B0/ptwL0IS@fuz.su>
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On 4/17/21 1:00 AM, Robert Clausecker wrote: > Greetings! > > Last time I experimented with ZFS on the RPi 4B, I noticed that > there is a strange problem when attaching the zpool via USB 3 as > opposed to USB 2. When doing that, mounting root fails with > IO errors like these: > > (da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 03 c1 b9 65 00 00 07 00 > (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error > (da0:umass-sim0:0:0:0): Retrying command, 3 more tries remain > (da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 03 c1 b9 65 00 00 07 00 > (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error > (da0:umass-sim0:0:0:0): Retrying command, 2 more tries remain > > Attaching the boot disk through USB 2 instead works. Likewise, > using USB 3 with a UFS root file system works (and in fact ran fine > in a development system for months). I do not understand this. > > I had previously reported this issue as PR 249520: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249520 > > There's some stuff about UEFI booting in there which you can ignore. > The same problem also appears when booting via U-Boot. > > Now what surprises me is that this issue still occurs with > FreeBSD 13.0-RELEASE. So whatever fixes had been performed > did not seem to address the underlying problem at all. > > Is there any workaround or solution (except for ditching root > on ZFS which would be rather painful for my use case?) > > Yours, > Robert Clausecker > Weird that UFS works, but ZFS doesn't. This is really on the same disk? Just checking. I can only add a datapoint that I'm running 13.0 on ZFS on USB3 on RPI4-8GB without problems. Could it be a partitioning difference that you are crossing 4K-sector boundaries or something else that amplifies the traffic when using ZFS? Or bad sectors which are nog used with UFS? Another possibility with your hardware: https://twitter.com/bsdimp/status/1383165361734832132?s=20 13.0 increased maxphys which is the size of the data transfers send to the disk. Can you try kern.maxphys=131072 in loader.conf? [root@rpi4 ~]# usbconfig ugen0.1: <0x1106 XHCI root HUB> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=SAVE (0mA) ugen0.2: <vendor 0x2109 USB2.0 Hub> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps) pwr=SAVE (100mA) ugen0.3: <Western Digital Elements 25A2> at usbus0, cfg=0 md=HOST spd=SUPER (5.0Gbps) pwr=ON (224mA) <--- Regards, Ronald.
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