Best way to use zram in Fedora 21?

Reindl Harald h.reindl at
Fri Nov 28 00:39:34 UTC 2014

Am 28.11.2014 um 01:34 schrieb Zbigniew Jędrzejewski-Szmek:
> On Fri, Nov 28, 2014 at 01:21:26AM +0100, Zbigniew Jędrzejewski-Szmek wrote:
>> On Thu, Nov 27, 2014 at 04:42:36PM +0100, Juan Orti wrote:
>>> El 2014-11-27 14:48, Reindl Harald escribió:
>>>> Am 27.11.2014 um 14:25 schrieb Juan Orti:
>>>>> Reindl, I'm of the opinion you should upload your scripts to some git
>>>>> repository and package them to be part of the distribution. I can
>>>>> co-maintain if you wish
>>>> feel free to package it!
>>>> that's why i attached it as i saw the topic
>>>> i am not a active packager on the Fedora infrastrcuture
>>> Ok, I've uploaded the scripts to GitHub and submitted a review request:
>> I have a question about the code: why are multiple swap devices needed?
>> /sys/block/zram0/max_comp_streams can be set to whatever number is
>> wanted. While it might be useful to have additional zram devices
>> for different purposes, I don't think more than one zram swap is
>> useful. If you only have one device, then reloading the module is
>> no longer necessary to change the parameters, since everything
>> else seems to be configurable through sysfs.
> And another question (sorry, I never used compressed swap before):
> why not zswap? It seems to be a better fit for the desktop/server
> environments that Fedora is used for. IIUC, zswap is better because
> it overflows automatically into the backing swap device

on machines with plenty RAM i prefer not have a swap partition or a swap 
file at all - especially on virtual machines it's a waste of (possible 
expensive SAN) disk storage

on virtual servers currently i prefer zram inside the guest to avoid OOM 
conditions in the guest while the memory compression of the hypervisor 
steps in too late and is more for overcommit the host

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