it's a definite win for large configurations infrequent swapping, much
more additional RAM), as well as for small configurations where there's
a lot of swapping (faster than swapping).
I wrote and use an init script that breaks up the zswap into n devices,
1 per cpu execution thread, to fully parallel the operation. If you
swap 64KiB at once with 8 core plus hyperthreading, the kernel will do
16 4k pages in parallel under that configuration--big, multi-CPU,
hypethreaded servers (it's a big 30% gain with parallel like threads,
i.e. compression) benefit much from this.
Less useful in VMs, where such things should really happen at the
hypervisor.
On 12/07/2012 05:32 PM, Fabio Pedretti wrote:
It would be nice if Ubuntu could include zram-config by default. This package
set up compressed RAM swap space and can lower RAM requirements for running and
installing Ubuntu. It should be a win for every configuration. Since kernel 3.8
the zram module is out of staging, I am using it since precise with no problem.
The bug request is here:
https://bugs.launchpad.net/ubuntu/+source/zram-config/+bug/381059
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