top and free report twice as much swap as I actually have

[Glyphobet]

Upon rebooting into 2.6.20-16-generic, top and free now report that I have 6GB of swap, as opposed to the 3GB that I have. Under previous kernel versions, I have always seen the correct amount of swap. There is no way I could have 6GB of swap; the partition is, and has always been, 3GB.

# top
top - 14:24:21 up 51 min, 9 users, load average: 0.40, 0.60, 1.11
Tasks: 141 total, 1 running, 140 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.8%us, 0.2%sy, 0.0%ni, 96.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1035780k total, 767544k used, 268236k free, 14104k buffers
Swap: 6072488k total, 34496k used, 6037992k free, 291508k cached

# free
             total used free shared buffers cached
Mem: 1035780 771692 264088 0 14848 294424
-/+ buffers/cache: 462420 573360
Swap: 6072488 34496 6037992

# cfdisk
                                  cfdisk 2.12r

                              Disk Drive: /dev/sda
                       Size: 250058301440 bytes, 250.0 GB
             Heads: 255 Sectors per Track: 63 Cylinders: 30401

    Name Flags Part Type FS Type [Label] Size (MB)
 ------------------------------------------------------------------------------
    sda1 Boot Primary Linux ext3 [/] 246947.59
    sda5 Logical Linux swap / Solaris 3109.16

[Timo Aaltonen (tjaalton)]

What does 'swapon -s' say?

[Glyphobet (glyphobet)]

# swapon -s
Filename Type Size Used Priority
/dev/sda5 partition 3036244 947632 -1
/dev/mapper/sda5 partition 3036244 0 -2

[Timo Aaltonen (tjaalton)]

Right, you have the same partition listed twice. Check your fstab :)

Not a bug.

[Glyphobet (glyphobet)]

No, I don't have the same partition listed twice.

# cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sda1 -- converted during upgrade to edgy
UUID=6b1341c8-ae37-44e2-a4a0-eb987eeeb66f / ext3 defaults,noatime,errors=remount-ro 0 1
# /dev/sda5 -- converted during upgrade to edgy
UUID=0f66b4ca-b9cb-4058-836c-e41113b48c23 none swap sw 0 0
/dev/hdd /media/cdrom0 udf,iso9660 user,noauto 0 0
/dev/fd0 /media/floppy0 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy1 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy2 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy3 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy4 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy5 auto rw,user,noauto 0 0
/dev/fd0 /media/floppy6 auto rw,user,noauto 0 0

[Soren Hansen (soren)]

Do you have evms installed? If you don't need, please it remove it, and you're likely to be much happier.

[Glyphobet (glyphobet)]

I *did* have evms installed at some point. The 7.04 to 7.10 upgrade introduced problems with evms, though ( http://brainsik.theory.org/.:./2007/ubuntu-710-gutsy-caveat-beware-evms/ ), so I removed it, and that was around the same time that this double-swap problem went away. Curious. :)

[Chow Loong Jin (hyperair)]

Not really curious. evms caused almost all partitions to have a duplicate in /dev/mapper and so broke mounting partitions as they claimed to have been locked or currently mounted. In this same way, there the partition is listed once in /dev/mapper/sda5 and /dev/sda5. Hence top and free see two swap partitions available and hence multiply your values by an order of 2.