Re: General performance of NAND operations i.e mount and ls

[Konstantin Kletschke <lists@ku-gbr.de>]

Am 2007-09-06 12:11 +0300 schrieb Artem Bityutskiy:

> Try to measure raw R/W, e.g with dd. But beware dd will fail at the
> first met bad block. Something like:

Okay, what would I roughly excpect on this system?

# time dd if=/dev/mtd4 of=/dev/null bs=4096 count=512
512+0 records in
512+0 records out
real    0m 0.61s
user    0m 0.01s
sys     0m 0.61s
# time dd if=/dev/zero of=/dev/mtd4 bs=4096 count=512
512+0 records in
512+0 records out
real    0m 1.08s
user    0m 0.00s
sys     0m 1.08s

Meanwhile I played around with 2.6.23-rc3:

modprobe ubi mtd=4:

UBI: empty MTD device detected
UBI: create volume table (copy #1)
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 0:512,
written 0 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 1:512,
written 0 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 2:512,
written 0 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 3:512,
written 0 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 4:512,
written 0 bytes
UBI error: ubi_io_write: error -5 while writing 512 bytes to PEB 5:512,
written 0 bytes
UBI warning: io_init: EC and VID headers are in the same minimal I/O
unit, switch to read-only mode
UBI error: validate_ec_hdr: bad VID header offset 512, expected 128
UBI error: validate_ec_hdr: bad EC header
UBI error: ubi_io_read_ec_hdr: validation failed for PEB 0

Konsti

PS.: does anybody know where the IRQs have gone?
2.6.20:
eth0: dm9000 at c8850000,c8852004 IRQ 133 MAC: 00:0c:7f:01:23:47
2.6.23-rc3:
eth0: dm9000 at c8878000,c887a004 IRQ 165 MAC: 00:0c:7f:01:23:47
Both cases on GPIO101

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