tag 596865 + moreinfo kthxbye Hi,
Simon Waters wrote: > Package: dphys-swapfile > Version: 20061020-1 > Severity: normal > > Subject: dphys-swapfile: Memory calculation is wrong for AMD 64bit systems > > As noted in bug 564466 [...] While the subject of your bug report suggests that you are reporting the same issue as #564466, the fact that you seem to know about that bug makes me wonder what kind of problem you really try to report, as the remainder of your report just seems to document some details of the already fixed issue of #564466 (http://bugs.debian.org/564466): > on AMD 64 systems the /proc/kcore size is reported as excessively > large due to the handling of vmalloc on that platform. > > The kernel documentation was in error, claiming that kcore would be > size of memory with a small adjustment when it is (now at least) > more complex than that. > > If we must rely on /proc interface then the second field of the > first line of /proc/meminfo contains size of RAM. As per changes > below, however I'm not sure if relying on /proc is a good idea, I > haven't checked kernel source to see if it is always the first line, > or if the unit field is hard coded. So probably wise to make a more > robust case than this. > > I'm still trying to understand fully how AMD64 handles memory usage > so probably wise to run this past someone who does understand the > topic better. In 20061020-3 this is solved as follows: # this seems to be the nearest to physical RAM size, lacks about 60k # but it actually then fails from AMD64 kernel 2.6.32 onwards #KCORESIZE="`ls -l /proc/kcore | awk '{ print $5 }'`" ## make MBytes which rounded down will be exactly 1 too few, so add 1 #MEMSIZE="`expr "${KCORESIZE}" / 1048576 + 1`" # so second attempt at finding out physical RAM size, lacks about 10M # see how long this variant stays usable :-) MEMTOTAL="`grep '^MemTotal:' /proc/meminfo | awk '{ print $2 }'`" # make MBytes which rounded down will be about 10 too few, so add 10 MEMSIZE="`expr "${MEMTOTAL}" / 1024 + 10`" Regards, Axel -- ,''`. | Axel Beckert <a...@debian.org>, http://people.debian.org/~abe/ : :' : | Debian Developer, ftp.ch.debian.org Admin `. `' | 1024D: F067 EA27 26B9 C3FC 1486 202E C09E 1D89 9593 0EDE `- | 4096R: 2517 B724 C5F6 CA99 5329 6E61 2FF9 CD59 6126 16B5 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
