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Your test work fine on my device. I see that you run it from /media/mmc1so I guess you format your memory card with ext2. Mine still vfat so I can't. If you got same error when running from internal memory then your device is broken. Siarhei Siamashka a écrit : Hello All, I'm sorry for a long chunk of quoted text at the end of this message (it describes the sympthoms of the problem), but looks like I got an almost reliable proof that there is something wrong with the hardware of my device :(I tried to find some software that could be used for benchmarking and LZMA SDK (http://www.7-zip.org/sdk.html) looked like an interesting option for doing it. But when run on Nokia 770, it sometimes works normally and sometimes fails with the following error message: /media/mmc1 $ time ./lzma b -d19 LZMA 4.43 Copyright (c) 1999-2006 Igor Pavlov 2006-06-04 Compressing Decompressing Error: CRC Error Command exited with non-zero status 1 real 1m 37.14s user 1m 36.10s sys 0m 0.74s As you see, it failed internal test and was unable to decompress data back correctly. LZMA is an advanced compression algorithm and uses quite a lot of memory (it shows ~20MB memory usage in top with '-d19' option). If any of the bits within this memory block has problems, it can affect data integrity and cause incorrect compression or decompression. So probably lzma can be also used as some kind of memory checker. But it may be also some problem in LZMA code and not in my Nokia 770 hardware, so I would like to ask somebody to run the same test and check if the same problem can be reproduced. You can download the sources of LZMA SDK using this link: http://prdownloads.sourceforge.net/sevenzip/lzma443.tar.bz2?download Decompress this archive, change to 'C/7zip/Compress/LZMA_Alone' directory and run 'make -f makefile.gcc' to compile it. Alternatively you can use my compiled binary: http://ufo2000.xcomufo.com/files/lzma.gz Considering that this test program works fine in scratchbox with qemu, LZMA SDK page mentions performance on ARM and the existence of LZMA debian package for ARM, I think that software bug theory is not very relevant, but it still needs to be confirmed. I will wait for feedback in order to confirm if the problem really exists in my hardware. But looks like it is a high probability that I will have to make some kind of more advanced memory checker, try to identify faulty memory physical address and experiment with badram kernel patch. On Wednesday 23 August 2006 23:09, you wrote: |
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