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From: Anton A. <ai...@ca...> - 2007-09-14 08:07:33
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Hi, On 13 Sep 2007, at 21:35, mar...@es... wrote: > When copying large amounts of data (> 25GB) from an NTFS mount, my > kernel > panics. Ouch. Would it be possible for you to write down and email the actual panic text? (Or capture it via serial console if you don't want to type it by hand...) > escabot log # uname -a > Linux escabot 2.6.21-gentoo-r4 #3 SMP PREEMPT Thu Sep 13 14:44:12 > EDT 2007 > i686 AMD Opteron(tm) Processor 280 AuthenticAMD GNU/Linux Out of curiosity. Why are you running a 32-bit kernel on such a large 64-bit machine?!? Your machine would run a lot quicker with a 64-bit kernel (and 64-bit user space)... > I watch top while copying the files and it just sucks up all of the > memory. It gets to a point for a while where it seems to copy fine > leaving > just a few megabytes of memory free. If I copy smaller sets of > data, it > seems to work fine (but still sucks all the memory it can). This > machine > has 12GB of memory. > > I have tried several times and I can pretty much get it to always > dump if > I copy enough stuff over. The last time I recompiled the kernel > with NTFS > debug support and enabled the debugging messages. I am attaching a > gzip'd > file of the kernel messages. Great, thanks. > If attaching a file and sending it to the mailing list is improper > etiquette, let me know and I can post it on a web page or do something > else. No that is fine! > I'm not sure if this is a bug or something I'm doing wrong. > > Thank you for your time. The kernel panic()ing is always a kernel bug! The question is what are you copying to? You said you are copying those large files from NTFS but never said what file system is the destination... To see whether it is NTFS at fault (I don't think it is, I think it is either your destination file system or a bug in the VFS/VM not a in a file system at all) try to copy to /dev/null, i.e. if you are copying using "cp" command then do: cp /path/to/ntfs/volume/huge26gbfile /dev/null If you use "dd" then do: dd if=/path/to/ntfs/volume/huge26gbfile of=/dev/null [insert your usual dd options here] Also out of interest what command are you exactly running to do the copying? That will effectively read in the whole file but throw what it reads away instead of writing it to another file system. Does this work or also panic? My expectation is that it will work fine but there is only one way to find out and that is for you to try it! (-: Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer, http://www.linux-ntfs.org/ |
