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From: Al Boldi on 20 Jul 2010 08:20
I have noticed a big swapout performance regression on recent kernels using
the following testcase:

swapon /dev/md0 (raid0)
mount none /dev/shm -t tmpfs -o size=10G
cat /dev/full > /dev/shm/tst.dmp

Kernel starts to swapout at full speed after filling physical ram.
Then, kernel progressively slows down swapout after crossing the ~3G VM
threshold, compounding at over 50% slowdown when reaching the 10G tmpfs
limit.

Has this been fixed?


Thanks!

--
Al

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Prev: [PATCH] cpufreq: fix memory leak in cpufreq_add_dev
Next: writeback: move bdi threads exiting logic to the forker thread