* Confuse with WL_THRESHOLD [not found] <a1fb7300906022244g5cd882acw7de4b9b0ecc35547@mail.gmail.com> @ 2009-06-06 0:03 ` Thang Dao Duy 2009-06-07 10:23 ` Artem Bityutskiy 0 siblings, 1 reply; 4+ messages in thread From: Thang Dao Duy @ 2009-06-06 0:03 UTC (permalink / raw) To: linux-mtd Hi everyone. I used NANDsim and ubifs not for along time. Now, I have confused with wear-leveling threshold. If i give parameter WL_THRESHOLD in Kernel is small (example, the value is 3), then when i write a file size 2 MiB to NAND about 200 times, it makes me cannot read EC and VID headers of one PEB (example PEB 10). May be that PEB is bad ? And when i set the WL_THRESHOLD is higher (the value is 20), i write a file 2MiB about 1000 times, nothing 's happen, i can read headers of any PEB. So can you tell me what make this happen, and show me where in ubi source in kernel. Thanks. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Confuse with WL_THRESHOLD 2009-06-06 0:03 ` Confuse with WL_THRESHOLD Thang Dao Duy @ 2009-06-07 10:23 ` Artem Bityutskiy 2009-06-08 7:26 ` Artem Bityutskiy 0 siblings, 1 reply; 4+ messages in thread From: Artem Bityutskiy @ 2009-06-07 10:23 UTC (permalink / raw) To: Thang Dao Duy; +Cc: linux-mtd On Sat, 2009-06-06 at 07:03 +0700, Thang Dao Duy wrote: > Hi everyone. > I used NANDsim and ubifs not for along time. Now, I have confused with > wear-leveling threshold. If i give parameter WL_THRESHOLD in Kernel is > small (example, the value is 3), then when i write a file size 2 MiB > to NAND about 200 times, it makes me cannot read EC and VID headers of > one PEB (example PEB 10). May be that PEB is bad ? And when i set the > WL_THRESHOLD is higher (the value is 20), i write a file 2MiB about > 1000 times, nothing 's happen, i can read headers of any PEB. So can > you tell me what make this happen, and show me where in ubi source in > kernel. Looks like a bug. Please, describe precisely how to reproduce it, and I'll take a look at this. -- Best regards, Artem Bityutskiy (Битюцкий Артём) ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Confuse with WL_THRESHOLD 2009-06-07 10:23 ` Artem Bityutskiy @ 2009-06-08 7:26 ` Artem Bityutskiy 2009-06-10 3:31 ` Thang Dao Duy 0 siblings, 1 reply; 4+ messages in thread From: Artem Bityutskiy @ 2009-06-08 7:26 UTC (permalink / raw) To: Thang Dao Duy; +Cc: linux-mtd On Sun, 2009-06-07 at 13:23 +0300, Artem Bityutskiy wrote: > On Sat, 2009-06-06 at 07:03 +0700, Thang Dao Duy wrote: > > Hi everyone. > > I used NANDsim and ubifs not for along time. Now, I have confused with > > wear-leveling threshold. If i give parameter WL_THRESHOLD in Kernel is > > small (example, the value is 3), then when i write a file size 2 MiB > > to NAND about 200 times, it makes me cannot read EC and VID headers of > > one PEB (example PEB 10). May be that PEB is bad ? And when i set the > > WL_THRESHOLD is higher (the value is 20), i write a file 2MiB about > > 1000 times, nothing 's happen, i can read headers of any PEB. So can > > you tell me what make this happen, and show me where in ubi source in > > kernel. > > Looks like a bug. Please, describe precisely how to reproduce it, > and I'll take a look at this. Please, also make sure you are using the latest UBI/UBIFS. Please, take a look here: http://www.linux-mtd.infradead.org/doc/ubifs.html#L_how_send_bugreport I've configured my UBI and made the threshold to be 3 now. I've also enabled additional UBI and UBIFS debugging checks. I'm running the following test: $ sudo modprobe nandsim $ sudo modprobe ubi mtd=0 $ sudo ubimkvol /dev/ubi0 -m -N test_fs Set volume size to 128674304 Volume ID 0, size 8107 LEBs (128674304 bytes, 122.7 MiB), LEB size 15872 bytes (15.5 KiB), dynamic, name "test_fs", alignment 1 $ sudo modprobe ubifs $ sudo mount -t ubifs ubi0:test_fs /mnt/ubifs/ $ while true; do sudo dd if=/dev/urandom of=ubifs/file count=2048; sync; done 2097152 bytes (2.1 MB) copied, 0.316768 s, 6.6 MB/s 4096+0 records in 4096+0 records out .... It's being run for some time now, so far so good - no issues. -- Best regards, Artem Bityutskiy (Битюцкий Артём) ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Confuse with WL_THRESHOLD 2009-06-08 7:26 ` Artem Bityutskiy @ 2009-06-10 3:31 ` Thang Dao Duy 0 siblings, 0 replies; 4+ messages in thread From: Thang Dao Duy @ 2009-06-10 3:31 UTC (permalink / raw) To: dedekind; +Cc: linux-mtd On Mon, Jun 8, 2009 at 2:26 PM, Artem Bityutskiy<dedekind@infradead.org> wrote: > On Sun, 2009-06-07 at 13:23 +0300, Artem Bityutskiy wrote: >> On Sat, 2009-06-06 at 07:03 +0700, Thang Dao Duy wrote: >> > Hi everyone. >> > I used NANDsim and ubifs not for along time. Now, I have confused with >> > wear-leveling threshold. If i give parameter WL_THRESHOLD in Kernel is >> > small (example, the value is 3), then when i write a file size 2 MiB >> > to NAND about 200 times, it makes me cannot read EC and VID headers of >> > one PEB (example PEB 10). May be that PEB is bad ? And when i set the >> > WL_THRESHOLD is higher (the value is 20), i write a file 2MiB about >> > 1000 times, nothing 's happen, i can read headers of any PEB. So can >> > you tell me what make this happen, and show me where in ubi source in >> > kernel. >> >> Looks like a bug. Please, describe precisely how to reproduce it, >> and I'll take a look at this. > > Please, also make sure you are using the latest UBI/UBIFS. Please, take > a look here: > http://www.linux-mtd.infradead.org/doc/ubifs.html#L_how_send_bugreport > > I've configured my UBI and made the threshold to be 3 now. I've also > enabled additional UBI and UBIFS debugging checks. I'm running the > following test: > > $ sudo modprobe nandsim > $ sudo modprobe ubi mtd=0 > $ sudo ubimkvol /dev/ubi0 -m -N test_fs > Set volume size to 128674304 > Volume ID 0, size 8107 LEBs (128674304 bytes, 122.7 MiB), LEB size 15872 bytes (15.5 KiB), dynamic, name "test_fs", alignment 1 > $ sudo modprobe ubifs > $ sudo mount -t ubifs ubi0:test_fs /mnt/ubifs/ > $ while true; do sudo dd if=/dev/urandom of=ubifs/file count=2048; sync; done > 2097152 bytes (2.1 MB) copied, 0.316768 s, 6.6 MB/s > 4096+0 records in > 4096+0 records out > .... > > It's being run for some time now, so far so good - no issues. > > -- > Best regards, > Artem Bityutskiy (Битюцкий Артём) > > Thanks to Atem Bityutskiy. I have modified some code in kernel drivers/mtd/nand/, so may be it makes that happen. I tested the useful nand (512 and 2048 byte page size), it have the same with small or big WL_THRESHOLD. So that is my fault. ^ permalink raw reply [flat|nested] 4+ messages in thread
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[not found] <a1fb7300906022244g5cd882acw7de4b9b0ecc35547@mail.gmail.com>
2009-06-06 0:03 ` Confuse with WL_THRESHOLD Thang Dao Duy
2009-06-07 10:23 ` Artem Bityutskiy
2009-06-08 7:26 ` Artem Bityutskiy
2009-06-10 3:31 ` Thang Dao Duy
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