2.4.24 + cryptoloop: __alloc_pages: 5-order allocation failed

[Christian Kujau]

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hi,

today i played around with some benchmarks i do from time to time [1]
this time with 2.4.24 and the cryptoloop patch
(patch-cryptoloop-jari-2.4.22.0, applies to 2.4.24 too) when using this
machine (powerpc)

http://www.nerdbynature.de/bits/sheep/2.4.24-benh/ver_linux

in short: i have a 700 MB file, losetup a loop device with a cipher
(aes,cast5,cast6,blowfish,serpent,twofish), create an ext3 fs on it.
then test with "tiobench" (size is only about 100MB). but the benchmarks
did not last very long, i have these messages in my syslog:

Dec 21 23:42:45 sheep kernel: __alloc_pages: 0-order allocation failed
(gfp=0x1d2/0)
Dec 21 23:42:45 sheep kernel: VM: killing process nmbd
Dec 21 23:43:07 sheep kernel: __alloc_pages: 0-order allocation failed
(gfp=0x1d2/0)
[...]
Dec 23 22:26:37 sheep kernel: __alloc_pages: 5-order allocation failed
(gfp=0x20/0)
Dec 23 22:26:39 sheep kernel: __alloc_pages: 5-order allocation failed
(gfp=0x20/0)
Dec 23 22:26:40 sheep kernel: __alloc_pages: 5-order allocation failed
(gfp=0x20/0)
Dec 23 22:26:41 sheep kernel: __alloc_pages: 5-order allocation failed
(gfp=0x20/0)
[...]
Feb 16 15:17:21 sheep kernel: __alloc_pages: 0-order allocation failed
(gfp=0x30/0)

full log excerpt on:
http://www.nerdbynature.de/bits/sheep/2.4.24/messages-alloc_pages

i am then able to sysrq-S, but not all partitions can be synced, then i
try sysrq-E / -I / -U with no luck, nothing seems to be written/read
to/from the disk, sysrq-B works :-)

i did manage to make earlier tests with different filesystems [2] and
linux 2.4.22 and have never had these messages.

Thanks for your hints,
Christian.

[1] http://www.nerdbynature.de/bench/
[2] http://www.nerdbynature.de/bench/sheep/
- --
BOFH excuse #62:

need to wrap system in aluminum foil to fix problem
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