[OpenWrt-Devel] ar71xx: Update to 3.14 [Flash Erasing / Bandwidth ]

[Andre Valentin]

Hi Daniel,

thanks for the hint. I will check it the next days. I'm now a bit busy.
Also I noticed that TCP throughput went from 15MBit/s PPPoE to 6 MBit/s.
It seems it is about codel, because all streams get the same rate, if using multiple.
I jut want to share my expierence with 3.14 so the developer has some hints.

Kind regards,

On 10.08.2014 15:00, Daniel Golle wrote:
> Hi Andre,
>
> there were some changes related to fastmap, I suspect that
> commit c22301ad4fa0f4cf71e9c877d072e6f07a0bf682
> UBI: fastmap: fix backward compatibility with image_seq
> or something related might cause the problem you observe.
>
> How excactly did you flash the image to the device?
>
> Cheers
>
> Daniel
>
> On Sat, Aug 09, 2014 at 08:54:42PM +0200, Andre Valentin wrote:
>> Hi Daniel!
>>
>> Please take a look at this (old kernel 3.10)
>> [    3.420000] UBI: attaching mtd8 to ubi0
>> [    3.570000] UBI: EOF marker found, PEBs from 105 will be erased
>> [    3.580000] UBI: scanning is finished
>> [    3.610000] UBI: attached mtd8 (name "ubiroot", size 249 MiB) to ubi0
>> [    3.610000] UBI: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
>> [    3.620000] UBI: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
>> [    3.630000] UBI: VID header offset: 2048 (aligned 2048), data offset: 4096
>> [    3.630000] UBI: good PEBs: 1992, bad PEBs: 0, corrupted PEBs: 0
>> [    3.640000] UBI: user volume: 2, internal volumes: 1, max. volumes count: 128
>> [    3.650000] UBI: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 975457251
>> [    3.660000] UBI: available PEBs: 791, total reserved PEBs: 1201, PEBs reserved for bad PEB handling: 40
>> [    3.670000] UBI: background thread "ubi_bgt0d" started, PID 274
>> [    3.680000] mtd: device 9 (rootfs) set to be root filesystem
>>
>> And here the new one:
>> [    3.530000] UBI: auto-attach mtd8
>> [    3.530000] UBI: attaching mtd8 to ubi0
>> [    3.850000] UBI error: scan_peb: bad image sequence number 811584292 in PEB 224, expected 1326740447
>> [    3.860000] Erase counter header dump:
>> [    3.860000] 	magic          0x55424923
>> [    3.860000] 	version        1
>> [    3.870000] 	ec             1
>> [    3.870000] 	vid_hdr_offset 2048
>> [    3.870000] 	data_offset    4096
>> [    3.880000] 	image_seq      811584292
>> [    3.880000] 	hdr_crc        0xa455ffb3
>> [    3.880000] erase counter header hexdump:
>> [    3.890000] UBI error: ubi_attach_mtd_dev: failed to attach mtd8, error -22
>> [    3.900000] UBI error: ubi_auto_attach: cannot attach mtd8
>>
>> Are you sure about this? This Flash image is about 25 MiB, like the old one. So PEB 224 is in the area where ubi should erase all.
>> Seems to me that the erasing of the additional space is not done.
>> Also the message about the EOF marker is not displayed. Has there something changed between 3.10 and 3.14?
>>
>> Kind regards,
>>
>> André
>>


-- 
Mit freundlichen Grüßen,
André Valentin
Projektkoordination / Systemadministration

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