[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2022-05-06 Thread George Melikov
> It can be turned off during boot by using init_on_alloc=0 kernel parameter. So any user who is affected by this performance issue can mitigate that by disabling the hardening option, after considering its possible consequences. And one can find the root cause only by test and compare with other

[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2020-05-26 Thread Thadeu Lima de Souza Cascardo
init_on_alloc=1 as a default servers Ubuntu users as a security hardening mechanism, preventing a class of security issues from being exploitable. Disabling that in general would allow those unknown vulnerabilities open to be exploited. It can be turned off during boot by using init_on_alloc=0

[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2020-03-02 Thread Thadeu Lima de Souza Cascardo
Hi, Mr. Ahrens. For now, I am not yet convinced about removing the init_on_alloc default option. I would agree if anyone argues that a page recycling mechanism defeats the purpose of the option anyway. But it would, at least, be restricted to whatever uses such mechanisms. (I am familiar with

[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2020-02-12 Thread Matthew Ahrens
apport information ** Tags added: apport-collected bionic uec-images ** Description changed: Apologies if this is not the right forum to raise this concern. If not please point me to a better place to have this discussion. The 5.3 linux kernel added a new feature which allows pages to

[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2020-02-12 Thread Andy Whitcroft
@matthew.ahrens you can paste that URL into any browser on any machine and authorise it. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1862822 Title: init_on_alloc=1 causes big performance

[Bug 1862822] Re: init_on_alloc=1 causes big performance regression for ZFS

2020-02-11 Thread Matthew Ahrens
I installed apport and python3-launchpadlib, and ran the requested command: $ apport-collect 1862822 The authorization page: (https://launchpad.net/+authorize-token?oauth_token=KJm30XZW6qPv9HDzn45k_permission=DESKTOP_INTEGRATION) should be opening in your browser. Use your browser to authorize